[syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea

[syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    155a3c003e55 Merge tag 'for-6.16/dm-fixes-2' of git://git...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=166d6382580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f09d04131ef56b22
dashboard link: https://syzkaller.appspot.com/bug?extid=fa88eb476e42878f2844
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14b20d8c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ebe58c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8b4489a1d2de/disk-155a3c00.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1c498d4c0c85/vmlinux-155a3c00.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ea8acdf1d890/bzImage-155a3c00.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e47f2d7541be/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com

hpfs: filesystem error: warning: spare dnodes used, try chkdsk
hpfs: You really don't want any checks? You are crazy...
hpfs: hpfs_map_sector(): read error
hpfs: code page support is disabled
==================================================================
BUG: KASAN: use-after-free in strcmp+0x6f/0xc0 lib/string.c:283
Read of size 1 at addr ffff8880116728a6 by task syz-executor411/6741

CPU: 1 UID: 0 PID: 6741 Comm: syz-executor411 Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x230 mm/kasan/report.c:480
 kasan_report+0x118/0x150 mm/kasan/report.c:593
 strcmp+0x6f/0xc0 lib/string.c:283
 hpfs_get_ea+0x114/0xdb0 fs/hpfs/ea.c:139
 hpfs_read_inode+0x19d/0x1010 fs/hpfs/inode.c:63
 hpfs_fill_super+0x12bd/0x2070 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681
 vfs_get_tree+0x92/0x2b0 fs/super.c:1804
 do_new_mount+0x24a/0xa40 fs/namespace.c:3902
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f718b86112a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee99fcba8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffee99fcbc0 RCX: 00007f718b86112a
RDX: 0000200000009e80 RSI: 0000200000009ec0 RDI: 00007ffee99fcbc0
RBP: 0000200000009ec0 R08: 00007ffee99fcc00 R09: 0000000000009dfd
R10: 0000000000000041 R11: 0000000000000286 R12: 0000200000009e80
R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffee99fcc00
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11672
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001ff38c8 ffffea0001ff3908 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5213, tgid 5213 (udevd), ts 38150701195, free_ts 195740390996
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
 folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2438
 shmem_alloc_folio mm/shmem.c:1851 [inline]
 shmem_alloc_and_add_folio+0x447/0xf60 mm/shmem.c:1890
 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2536
 shmem_get_folio mm/shmem.c:2642 [inline]
 shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3292
 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3467
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x54b/0xa90 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 6740 tgid 6740 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 free_unref_folios+0xcd2/0x1570 mm/page_alloc.c:2763
 folios_put_refs+0x559/0x640 mm/swap.c:992
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1125
 shmem_truncate_range mm/shmem.c:1237 [inline]
 shmem_evict_inode+0x272/0xa70 mm/shmem.c:1365
 evict+0x501/0x9c0 fs/inode.c:810
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1114
 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141
 shrink_dcache_parent+0xa1/0x2c0 fs/dcache.c:-1
 do_one_tree+0x23/0xe0 fs/dcache.c:1604
 shrink_dcache_for_umount+0xa0/0x170 fs/dcache.c:1621
 generic_shutdown_super+0x67/0x2c0 fs/super.c:621
 kill_anon_super fs/super.c:1282 [inline]
 kill_litter_super+0x76/0xb0 fs/super.c:1292
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417
 task_work_run+0x1d4/0x260 kernel/task_work.c:227

Memory state around the buggy address:
 ffff888011672780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888011672800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888011672880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888011672900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888011672980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Forwarded: Private message regarding: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: Private message regarding: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea
Author: kapoorarnav43@gmail.com

#syz test 
From: Arnav Kapoor <kapoorarnav43@gmail.com>
Date: Fri, 18 Jul 2025 12:00:00 +0000
Subject: [PATCH] hpfs: fix use-after-free in hpfs_get_ea

Fix a use-after-free vulnerability in hpfs_get_ea() where corrupted
extended attribute data could cause strcmp() to access freed memory.

The issue occurs in the EA iteration loop where next_ea() can produce
invalid pointers due to insufficient validation of ea->namelen and
the calculated next EA position. This can lead to accessing memory
that has been freed or is outside valid boundaries.

Add proper bounds checking to ensure:
1. EA namelen is reasonable (< 256)
2. EA structure doesn't exceed the EA area bounds  
3. next_ea() result stays within valid EA boundaries

Reported-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Arnav Kapoor <kapoorarnav43@gmail.com>
---
 fs/hpfs/ea.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/fs/hpfs/ea.c b/fs/hpfs/ea.c
index 123456789abc..abcdef123456 100644
--- a/fs/hpfs/ea.c
+++ b/fs/hpfs/ea.c
@@ -135,8 +135,29 @@ char *hpfs_get_ea(struct super_block *s, struct fnode 
*fnode, char *key, int *s
  secno a;
  struct extended_attribute *ea;
  struct extended_attribute *ea_end = fnode_end_ea(fnode);
- for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
+ for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) {
+ /* Validate EA structure bounds */
+ if ((char *)ea + sizeof(*ea) > (char *)ea_end) {
+ hpfs_error(s, "EA structure exceeds bounds");
+ return NULL;
+ }
+ 
+ /* Validate namelen to prevent overflow */
+ if (ea->namelen >= 256) {
+ hpfs_error(s, "EA namelen too large: %d", ea->namelen);
+ return NULL;
+ }
+ 
+ /* Ensure name field is within bounds */
+ if ((char *)ea + 5 + ea->namelen > (char *)ea_end) {
+ hpfs_error(s, "EA name field exceeds bounds");
+ return NULL;
+ }
+ 
+ /* Validate next_ea() result will be within bounds */
+ if (next_ea(ea) > ea_end) {
+ hpfs_error(s, "next EA exceeds bounds");
+ return NULL;
+ }
+ 
  if (!strcmp(ea->name, key)) {
  if (ea_indirect(ea))
  return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = 
ea_len(ea));
@@ -147,6 +168,7 @@ char *hpfs_get_ea(struct super_block *s, struct fnode 
*fnode, char *key, int *s
  memcpy(ret, ea_data(ea), ea_valuelen(ea));
  ret[ea_valuelen(ea)] = 0;
  return ret;
+ }
  }
  a = le32_to_cpu(fnode->ea_secno);
  len = le32_to_cpu(fnode->ea_size_l);



On Friday, 18 July 2025 at 00:44:34 UTC+5:30 syzbot wrote:

Hello, 

syzbot found the following issue on: 

HEAD commit: 155a3c003e55 Merge tag 'for-6.16/dm-fixes-2' of git://git... 
git tree: upstream 
console+strace: https://syzkaller.appspot.com/x/log.txt?x=166d6382580000 
kernel config: https://syzkaller.appspot.com/x/.config?x=f09d04131ef56b22 
dashboard link: https://syzkaller.appspot.com/bug?extid=fa88eb476e42878f2844 
compiler: Debian clang version 20.1.7 
(++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 
20.1.7 
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b20d8c580000 
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ebe58c580000 

Downloadable assets: 
disk image: 
https://storage.googleapis.com/syzbot-assets/8b4489a1d2de/disk-155a3c00.raw.xz 
vmlinux: 
https://storage.googleapis.com/syzbot-assets/1c498d4c0c85/vmlinux-155a3c00.xz 
kernel image: 
https://storage.googleapis.com/syzbot-assets/ea8acdf1d890/bzImage-155a3c00.xz 
mounted in repro: 
https://storage.googleapis.com/syzbot-assets/e47f2d7541be/mount_0.gz 

IMPORTANT: if you fix the issue, please add the following tag to the 
commit: 
Reported-by: syzbot+fa88eb...@syzkaller.appspotmail.com 

hpfs: filesystem error: warning: spare dnodes used, try chkdsk 
hpfs: You really don't want any checks? You are crazy... 
hpfs: hpfs_map_sector(): read error 
hpfs: code page support is disabled 
================================================================== 
BUG: KASAN: use-after-free in strcmp+0x6f/0xc0 lib/string.c:283 
Read of size 1 at addr ffff8880116728a6 by task syz-executor411/6741 

CPU: 1 UID: 0 PID: 6741 Comm: syz-executor411 Not tainted 
6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS 
Google 05/07/2025 
Call Trace: 
<TASK> 
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 
print_address_description mm/kasan/report.c:378 [inline] 
print_report+0xca/0x230 mm/kasan/report.c:480 
kasan_report+0x118/0x150 mm/kasan/report.c:593 
strcmp+0x6f/0xc0 lib/string.c:283 
hpfs_get_ea+0x114/0xdb0 fs/hpfs/ea.c:139 
hpfs_read_inode+0x19d/0x1010 fs/hpfs/inode.c:63 
hpfs_fill_super+0x12bd/0x2070 fs/hpfs/super.c:654 
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681 
vfs_get_tree+0x92/0x2b0 fs/super.c:1804 
do_new_mount+0x24a/0xa40 fs/namespace.c:3902 
do_mount fs/namespace.c:4239 [inline] 
__do_sys_mount fs/namespace.c:4450 [inline] 
__se_sys_mount+0x317/0x410 fs/namespace.c:4427 
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] 
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 
entry_SYSCALL_64_after_hwframe+0x77/0x7f 
RIP: 0033:0x7f718b86112a 
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 
00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff 
ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 
RSP: 002b:00007ffee99fcba8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 
RAX: ffffffffffffffda RBX: 00007ffee99fcbc0 RCX: 00007f718b86112a 
RDX: 0000200000009e80 RSI: 0000200000009ec0 RDI: 00007ffee99fcbc0 
RBP: 0000200000009ec0 R08: 00007ffee99fcc00 R09: 0000000000009dfd 
R10: 0000000000000041 R11: 0000000000000286 R12: 0000200000009e80 
R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffee99fcc00 
</TASK> 

The buggy address belongs to the physical page: 
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11672 
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) 
raw: 00fff00000000000 ffffea0001ff38c8 ffffea0001ff3908 0000000000000000 
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 
page dumped because: kasan: bad access detected 
page_owner tracks the page as freed 
page last allocated via order 0, migratetype Movable, gfp_mask 
0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5213, tgid 5213 (udevd), ts 
38150701195, free_ts 195740390996 
set_page_owner include/linux/page_owner.h:32 [inline] 
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 
prep_new_page mm/page_alloc.c:1712 [inline] 
get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669 
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 
folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2438 
shmem_alloc_folio mm/shmem.c:1851 [inline] 
shmem_alloc_and_add_folio+0x447/0xf60 mm/shmem.c:1890 
shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2536 
shmem_get_folio mm/shmem.c:2642 [inline] 
shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3292 
generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3467 
new_sync_write fs/read_write.c:593 [inline] 
vfs_write+0x54b/0xa90 fs/read_write.c:686 
ksys_write+0x145/0x250 fs/read_write.c:738 
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] 
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 
entry_SYSCALL_64_after_hwframe+0x77/0x7f 
page last free pid 6740 tgid 6740 stack trace: 
reset_page_owner include/linux/page_owner.h:25 [inline] 
free_pages_prepare mm/page_alloc.c:1248 [inline] 
free_unref_folios+0xcd2/0x1570 mm/page_alloc.c:2763 
folios_put_refs+0x559/0x640 mm/swap.c:992 
folio_batch_release include/linux/pagevec.h:101 [inline] 
shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1125 
shmem_truncate_range mm/shmem.c:1237 [inline] 
shmem_evict_inode+0x272/0xa70 mm/shmem.c:1365 
evict+0x501/0x9c0 fs/inode.c:810 
__dentry_kill+0x209/0x660 fs/dcache.c:669 
shrink_kill+0xa9/0x2c0 fs/dcache.c:1114 
shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141 
shrink_dcache_parent+0xa1/0x2c0 fs/dcache.c:-1 
do_one_tree+0x23/0xe0 fs/dcache.c:1604 
shrink_dcache_for_umount+0xa0/0x170 fs/dcache.c:1621 
generic_shutdown_super+0x67/0x2c0 fs/super.c:621 
kill_anon_super fs/super.c:1282 [inline] 
kill_litter_super+0x76/0xb0 fs/super.c:1292 
deactivate_locked_super+0xbc/0x130 fs/super.c:474 
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417 
task_work_run+0x1d4/0x260 kernel/task_work.c:227 

Memory state around the buggy address: 
ffff888011672780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
ffff888011672800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
>ffff888011672880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
^ 
ffff888011672900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
ffff888011672980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
================================================================== 


--- 
This report is generated by a bot. It may contain errors. 
See https://goo.gl/tpsmEJ for more information about syzbot. 
syzbot engineers can be reached at syzk...@googlegroups.com. 

syzbot will keep track of this issue. See: 
https://goo.gl/tpsmEJ#status for how to communicate with syzbot. 

If the report is already addressed, let syzbot know by replying with: 
#syz fix: exact-commit-title 

If you want syzbot to run the reproducer, reply with: 
#syz test: git://repo/address.git branch-or-commit-hash 
If you attach or paste a git patch, syzbot will apply it before testing. 

If you want to overwrite report's subsystems, reply with: 
#syz set subsystems: new-subsystem 
(See the list of subsystem names on the web dashboard) 

If the report is a duplicate of another one, reply with: 
#syz dup: exact-subject-of-another-report 

If you want to undo deduplication, reply with: 
#syz undup 

Forwarded: Private message regarding: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: Private message regarding: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea
Author: kapoorarnav43@gmail.com

#syz test 

From: Arnav Kapoor <kapoorarnav43@gmail.com>
Date: Fri, 18 Jul 2025 12:00:00 +0000
Subject: [PATCH] hpfs: fix use-after-free in hpfs_get_ea

Fix a use-after-free vulnerability in hpfs_get_ea() where corrupted
extended attribute data could cause strcmp() to access freed memory.

The issue occurs in the EA iteration loop where next_ea() can produce
invalid pointers due to insufficient validation of ea->namelen and
the calculated next EA position. This can lead to accessing memory
that has been freed or is outside valid boundaries.

Add proper bounds checking to ensure:
1. EA namelen is reasonable (< 256)
2. EA structure doesn't exceed the EA area bounds  
3. next_ea() result stays within valid EA boundaries

Reported-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Arnav Kapoor <kapoorarnav43@gmail.com>
---
 fs/hpfs/ea.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/fs/hpfs/ea.c b/fs/hpfs/ea.c
index 102ba18e561f..7e6e43010fec 100644
--- a/fs/hpfs/ea.c
+++ b/fs/hpfs/ea.c
@@ -135,7 +135,31 @@ char *hpfs_get_ea(struct super_block *s, struct fnode 
*fnode, char *key, int *si
  secno a;
  struct extended_attribute *ea;
  struct extended_attribute *ea_end = fnode_end_ea(fnode);
- for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
+ for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) {
+ /* Validate EA structure bounds */
+ if ((char *)ea + sizeof(*ea) > (char *)ea_end) {
+ hpfs_error(s, "EA structure exceeds bounds");
+ return NULL;
+ }
+ 
+ /* Validate namelen to prevent overflow */
+ if (ea->namelen >= 256) {
+ hpfs_error(s, "EA namelen too large: %d", ea->namelen);
+ return NULL;
+ }
+ 
+ /* Ensure name field is within bounds */
+ if ((char *)ea + 5 + ea->namelen > (char *)ea_end) {
+ hpfs_error(s, "EA name field exceeds bounds");
+ return NULL;
+ }
+ 
+ /* Validate next_ea() result will be within bounds */
+ if (next_ea(ea) > ea_end) {
+ hpfs_error(s, "next EA exceeds bounds");
+ return NULL;
+ }
+ 
  if (!strcmp(ea->name, key)) {
  if (ea_indirect(ea))
  return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = 
ea_len(ea));
@@ -147,6 +171,7 @@ char *hpfs_get_ea(struct super_block *s, struct fnode 
*fnode, char *key, int *si
  ret[ea_valuelen(ea)] = 0;
  return ret;
  }
+ }
  a = le32_to_cpu(fnode->ea_secno);
  len = le32_to_cpu(fnode->ea_size_l);
  ano = fnode_in_anode(fnode);


On Friday, 18 July 2025 at 18:10:08 UTC+5:30 syzbot wrote:

Hello, 

syzbot tried to test the proposed patch but the build/boot failed: 

failed to apply patch: 
checking file fs/hpfs/ea.c 
patch: **** malformed patch at line 36: if (ea_indirect(ea)) 




Tested on: 

commit: 6832a931 Merge tag 'net-6.16-rc7' of git://git.kernel... 
git tree: upstream 
kernel config: https://syzkaller.appspot.com/x/.config?x=f09d04131ef56b22 
dashboard link: https://syzkaller.appspot.com/bug?extid=fa88eb476e42878f2844 
compiler: 
patch: https://syzkaller.appspot.com/x/patch.diff?x=129db382580000 

Forwarded: Private message regarding: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea

[syzbot]

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Subject: Private message regarding: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea
Author: kapoorarnav43@gmail.com

#syz test

Subject: [PATCH] hpfs: fix use-after-free in hpfs_get_ea

Fix a use-after-free vulnerability in hpfs_get_ea() where corrupted
extended attribute data could cause strcmp() to access freed memory.

The issue occurs in both EA iteration loops where next_ea() can produce
invalid pointers due to insufficient validation of ea->namelen and the
calculated next EA position. This can lead to accessing memory that has
been freed or is outside valid boundaries.

The vulnerability manifests when strcmp(ea->name, key) is called with
ea pointing to corrupted memory. Add comprehensive bounds checking:

1. First loop (fnode EA area): Validate EA structure, namelen bounds,
   name field boundaries, and next_ea() results before strcmp()
2. Second loop (external EA): Validate namelen and buffer bounds after
   reading EA data from disk before strcmp()

This addresses both the original crash at line 139 and prevents the
secondary crash that would occur at the external EA strcmp() call.

Reported-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Arnav Kapoor <kapoorarnav43@gmail.com>

---
 fs/hpfs/ea.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/fs/hpfs/ea.c b/fs/hpfs/ea.c
index 102ba18e561f..ab1234567890 100644
--- a/fs/hpfs/ea.c
+++ b/fs/hpfs/ea.c
@@ -135,7 +135,31 @@ char *hpfs_get_ea(struct super_block *s, struct fnode 
*fnode, char *key, int *si
  secno a;
  struct extended_attribute *ea;
  struct extended_attribute *ea_end = fnode_end_ea(fnode);
- for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
+ for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) {
+ /* Validate EA structure bounds */
+ if ((char *)ea + sizeof(*ea) > (char *)ea_end) {
+ hpfs_error(s, "EA structure exceeds bounds");
+ return NULL;
+ }
+
+ /* Validate namelen to prevent overflow */
+ if (ea->namelen >= 256) {
+ hpfs_error(s, "EA namelen too large: %d", ea->namelen);
+ return NULL;
+ }
+
+ /* Ensure name field is within bounds */
+ if ((char *)ea + 5 + ea->namelen > (char *)ea_end) {
+ hpfs_error(s, "EA name field exceeds bounds");
+ return NULL;
+ }
+
+ /* Validate next_ea() result will be within bounds */
+ if (next_ea(ea) > ea_end) {
+ hpfs_error(s, "next EA exceeds bounds");
+ return NULL;
+ }
+
  if (!strcmp(ea->name, key)) {
  if (ea_indirect(ea))
  return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = 
ea_len(ea));
@@ -147,6 +171,7 @@ char *hpfs_get_ea(struct super_block *s, struct fnode 
*fnode, char *key, int *si
  ret[ea_valuelen(ea)] = 0;
  return ret;
  }
+ }
  a = le32_to_cpu(fnode->ea_secno);
  len = le32_to_cpu(fnode->ea_size_l);
  ano = fnode_in_anode(fnode);
@@ -162,6 +187,14 @@ char *hpfs_get_ea(struct super_block *s, struct fnode 
*fnode, char *key, int *si
  if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL;
  if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 
8 : 0), ex + 4))
  return NULL;
+
+ /* Validate namelen after reading EA data from disk */
+ if (ea->namelen >= 256) {
+ hpfs_error(s, "EA namelen too large in external EA: %d", ea->namelen);
+ return NULL;
+ }
+
+ /* Ensure name field doesn't exceed buffer bounds */
+ if (ea->namelen + 1 > sizeof(ex) - 4) {
+ hpfs_error(s, "EA name exceeds buffer in external EA");
+ return NULL;
+ }
+
  if (!strcmp(ea->name, key)) {
  if (ea_indirect(ea))
  return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = 
ea_len(ea));
-- 
2.34.1


On Friday, 18 July 2025 at 18:57:03 UTC+5:30 syzbot wrote:

Hello, 

syzbot has tested the proposed patch but the reproducer is still triggering 
an issue: 
KASAN: use-after-free Read in hpfs_get_ea 

hpfs: filesystem error: warning: spare dnodes used, try chkdsk 
hpfs: You really don't want any checks? You are crazy... 
hpfs: hpfs_map_sector(): read error 
hpfs: code page support is disabled 
================================================================== 
BUG: KASAN: use-after-free in hpfs_get_ea+0x1f7/0xca0 fs/hpfs/ea.c:146 
Read of size 1 at addr ffff8880719ea8a3 by task syz.0.16/6612 

CPU: 0 UID: 0 PID: 6612 Comm: syz.0.16 Not tainted 
6.16.0-rc6-syzkaller-00121-g6832a9317eee-dirty #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS 
Google 05/07/2025 
Call Trace: 
<TASK> 
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 
print_address_description mm/kasan/report.c:378 [inline] 
print_report+0xca/0x230 mm/kasan/report.c:480 
kasan_report+0x118/0x150 mm/kasan/report.c:593 
hpfs_get_ea+0x1f7/0xca0 fs/hpfs/ea.c:146 
hpfs_read_inode+0x19d/0x1010 fs/hpfs/inode.c:63 
hpfs_fill_super+0x12bd/0x2070 fs/hpfs/super.c:654 
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681 
vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 
do_new_mount+0x24a/0xa40 fs/namespace.c:3902 
do_mount fs/namespace.c:4239 [inline] 
__do_sys_mount fs/namespace.c:4450 [inline] 
__se_sys_mount+0x317/0x410 fs/namespace.c:4427 
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] 
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 
entry_SYSCALL_64_after_hwframe+0x77/0x7f 
RIP: 0033:0x7fb45e3900ca 
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 
00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff 
ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 
RSP: 002b:00007fb45f2c9e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 
RAX: ffffffffffffffda RBX: 00007fb45f2c9ef0 RCX: 00007fb45e3900ca 
RDX: 0000200000009e80 RSI: 0000200000009ec0 RDI: 00007fb45f2c9eb0 
RBP: 0000200000009e80 R08: 00007fb45f2c9ef0 R09: 0000000000000041 
R10: 0000000000000041 R11: 0000000000000246 R12: 0000200000009ec0 
R13: 00007fb45f2c9eb0 R14: 0000000000009e02 R15: 0000200000009fc0 
</TASK> 

The buggy address belongs to the physical page: 
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7fdaad200 
pfn:0x719ea 
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) 
raw: 00fff00000000000 ffffea0001c67988 ffffea0001c61d88 0000000000000000 
raw: 00000007fdaad200 0000000000000000 00000000ffffffff 0000000000000000 
page dumped because: kasan: bad access detected 
page_owner tracks the page as freed 
page last allocated via order 0, migratetype Movable, gfp_mask 
0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 6566, tgid 6566 
(sed), ts 134996856935, free_ts 135030622689 
set_page_owner include/linux/page_owner.h:32 [inline] 
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 
prep_new_page mm/page_alloc.c:1712 [inline] 
get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669 
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 
folio_alloc_mpol_noprof mm/mempolicy.c:2438 [inline] 
vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2473 
folio_prealloc+0x30/0x180 mm/memory.c:-1 
alloc_anon_folio mm/memory.c:5014 [inline] 
do_anonymous_page mm/memory.c:5071 [inline] 
do_pte_missing mm/memory.c:4249 [inline] 
handle_pte_fault mm/memory.c:6069 [inline] 
__handle_mm_fault+0x2c88/0x5620 mm/memory.c:6212 
handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6381 
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336 
handle_page_fault arch/x86/mm/fault.c:1476 [inline] 
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 
page last free pid 6566 tgid 6566 stack trace: 
reset_page_owner include/linux/page_owner.h:25 [inline] 
free_pages_prepare mm/page_alloc.c:1248 [inline] 
free_unref_folios+0xcd2/0x1570 mm/page_alloc.c:2763 
folios_put_refs+0x559/0x640 mm/swap.c:992 
free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:264 
__tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] 
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] 
tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] 
tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 
tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 
exit_mmap+0x44c/0xb50 mm/mmap.c:1297 
__mmput+0x118/0x410 kernel/fork.c:1121 
exit_mm+0x1da/0x2c0 kernel/exit.c:581 
do_exit+0x648/0x22e0 kernel/exit.c:952 
do_group_exit+0x21c/0x2d0 kernel/exit.c:1105 
__do_sys_exit_group kernel/exit.c:1116 [inline] 
__se_sys_exit_group kernel/exit.c:1114 [inline] 
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1114 
x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232 
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] 
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 
entry_SYSCALL_64_after_hwframe+0x77/0x7f 

Memory state around the buggy address: 
ffff8880719ea780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
ffff8880719ea800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
>ffff8880719ea880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
^ 
ffff8880719ea900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
ffff8880719ea980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
================================================================== 


Tested on: 

commit: 6832a931 Merge tag 'net-6.16-rc7' of git://git.kernel... 
git tree: upstream 
console output: https://syzkaller.appspot.com/x/log.txt?x=155f38f0580000 
kernel config: https://syzkaller.appspot.com/x/.config?x=f09d04131ef56b22 
dashboard link: https://syzkaller.appspot.com/bug?extid=fa88eb476e42878f2844 
compiler: Debian clang version 20.1.7 
(++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 
20.1.7 
patch: https://syzkaller.appspot.com/x/patch.diff?x=1644fd8c580000 

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Subject: 
Author: purvayeshi550@gmail.com

#syz-test

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#syz-test

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Subject: 
Author: purvayeshi550@gmail.com

#syz-test

Re: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea

[Tetsuo Handa]

#syz test

diff --git a/fs/hpfs/Kconfig b/fs/hpfs/Kconfig
index ac1e9318e65a..d3dfbe76be8a 100644
--- a/fs/hpfs/Kconfig
+++ b/fs/hpfs/Kconfig
@@ -15,3 +15,14 @@ config HPFS_FS
 
 	  To compile this file system support as a module, choose M here: the
 	  module will be called hpfs.  If unsure, say N.
+
+config HPFS_FS_ALLOW_NO_ERROR_CHECK_MODE
+	bool "Allow no-error-check mode for maximum speed"
+	depends on HPFS_FS
+	default n
+	help
+	  This option enables check=none mount option. If check=none is
+	  specified, users can expect maximum speed at the cost of minimum
+	  robustness. Sane users should not specify check=none option, for e.g.
+	  use-after-free bug will happen when the filesystem is corrupted or
+	  crafted.
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 42b779b4d87f..558093b2beab 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -285,7 +285,9 @@ static const struct constant_table hpfs_param_case[] = {
 };
 
 static const struct constant_table hpfs_param_check[] = {
+#ifdef CONFIG_HPFS_FS_ALLOW_NO_ERROR_CHECK_MODE
 	{"none",	0},
+#endif
 	{"normal",	1},
 	{"strict",	2},
 	{}

Re: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_get_ea

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
Tested-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com

Tested on:

commit:         3a866087 Linux 6.18-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14d2bb34580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=858c39e0498e4460
dashboard link: https://syzkaller.appspot.com/bug?extid=fa88eb476e42878f2844
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12cb467c580000

Note: testing is done by a robot and is best-effort only.

[PATCH] hpfs: make check=none mount option excludable

[Tetsuo Handa]

syzbot is reporting use-after-free read problem when a crafted HPFS image
was mounted with "check=none" option.

The "check=none" option is intended for only users who want maximum speed
and use the filesystem only on trusted input. But fuzzers are for using
the filesystem on untrusted input.

Mikulas Patocka (the HPFS maintainer) thinks that there is no need to add
some middle ground where "check=none" would check some structures and won't
check others. Therefore, to make sure that fuzzers and careful users do not
by error specify "check=none" at runtime, make "check=none" being
excludable at build time.

Reported-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=fa88eb476e42878f2844
Link: https://lkml.kernel.org/r/9ca81125-1c7b-ddaf-09ea-638bc5712632@redhat.com
Tested-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
 fs/hpfs/Kconfig | 11 +++++++++++
 fs/hpfs/super.c |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/fs/hpfs/Kconfig b/fs/hpfs/Kconfig
index ac1e9318e65a..d3dfbe76be8a 100644
--- a/fs/hpfs/Kconfig
+++ b/fs/hpfs/Kconfig
@@ -15,3 +15,14 @@ config HPFS_FS
 
 	  To compile this file system support as a module, choose M here: the
 	  module will be called hpfs.  If unsure, say N.
+
+config HPFS_FS_ALLOW_NO_ERROR_CHECK_MODE
+	bool "Allow no-error-check mode for maximum speed"
+	depends on HPFS_FS
+	default n
+	help
+	  This option enables check=none mount option. If check=none is
+	  specified, users can expect maximum speed at the cost of minimum
+	  robustness. Sane users should not specify check=none option, for e.g.
+	  use-after-free bug will happen when the filesystem is corrupted or
+	  crafted.
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 8ab85e7ac91e..656b1ae01812 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -285,7 +285,9 @@ static const struct constant_table hpfs_param_case[] = {
 };
 
 static const struct constant_table hpfs_param_check[] = {
+#ifdef CONFIG_HPFS_FS_ALLOW_NO_ERROR_CHECK_MODE
 	{"none",	0},
+#endif
 	{"normal",	1},
 	{"strict",	2},
 	{}
-- 
2.47.3

Re: [PATCH] hpfs: make check=none mount option excludable

[Mikulas Patocka]

On Tue, 14 Oct 2025, Tetsuo Handa wrote:

> syzbot is reporting use-after-free read problem when a crafted HPFS image
> was mounted with "check=none" option.
> 
> The "check=none" option is intended for only users who want maximum speed
> and use the filesystem only on trusted input. But fuzzers are for using
> the filesystem on untrusted input.
> 
> Mikulas Patocka (the HPFS maintainer) thinks that there is no need to add
> some middle ground where "check=none" would check some structures and won't
> check others. Therefore, to make sure that fuzzers and careful users do not
> by error specify "check=none" at runtime, make "check=none" being
> excludable at build time.

Hi

Would it be possible to change syzbot to not use the "check=none" option?

Mikulas

> Reported-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=fa88eb476e42878f2844
> Link: https://lkml.kernel.org/r/9ca81125-1c7b-ddaf-09ea-638bc5712632@redhat.com
> Tested-by: syzbot+fa88eb476e42878f2844@syzkaller.appspotmail.com
> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> ---
>  fs/hpfs/Kconfig | 11 +++++++++++
>  fs/hpfs/super.c |  2 ++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/fs/hpfs/Kconfig b/fs/hpfs/Kconfig
> index ac1e9318e65a..d3dfbe76be8a 100644
> --- a/fs/hpfs/Kconfig
> +++ b/fs/hpfs/Kconfig
> @@ -15,3 +15,14 @@ config HPFS_FS
>  
>  	  To compile this file system support as a module, choose M here: the
>  	  module will be called hpfs.  If unsure, say N.
> +
> +config HPFS_FS_ALLOW_NO_ERROR_CHECK_MODE
> +	bool "Allow no-error-check mode for maximum speed"
> +	depends on HPFS_FS
> +	default n
> +	help
> +	  This option enables check=none mount option. If check=none is
> +	  specified, users can expect maximum speed at the cost of minimum
> +	  robustness. Sane users should not specify check=none option, for e.g.
> +	  use-after-free bug will happen when the filesystem is corrupted or
> +	  crafted.
> diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
> index 8ab85e7ac91e..656b1ae01812 100644
> --- a/fs/hpfs/super.c
> +++ b/fs/hpfs/super.c
> @@ -285,7 +285,9 @@ static const struct constant_table hpfs_param_case[] = {
>  };
>  
>  static const struct constant_table hpfs_param_check[] = {
> +#ifdef CONFIG_HPFS_FS_ALLOW_NO_ERROR_CHECK_MODE
>  	{"none",	0},
> +#endif
>  	{"normal",	1},
>  	{"strict",	2},
>  	{}
> -- 
> 2.47.3
> 
> 
> 

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Subject: 
Author: nogikh@google.com

#syz invalid

Hasn't happened in a long while

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#syz invalid

Hasn't happened for a long while

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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
58717b2a1365

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#syz test

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Subject: 
Author: nogikh@google.com

Let's check if the command works.

#syz test

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Subject: 
Author: nogikh@google.com

Apparently, already fixed.

#syz invalid

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Subject: 
Author: nogikh@google.com

Hasn't been happening in a long while.

#syz invalid

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Subject: 
Author: nogikh@google.com

#syz invalid

hasn't happened in a while

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Subject: 
Author: nogikh@google.com

#syz invalid

It hasn't been happening in a very long time.

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Subject: 
Author: nogikh@google.com

#syz invalid

Actually already fixed

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Subject: 
Author: nogikh@google.com

#syz invalid

Fixed long ago

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Subject: 
Author: nogikh@google.com

#syz invalid

Actually fixed long ago.

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Subject: 
Author: nogikh@google.com

#syz invalid

Doesn't happen for a long time in fact.

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Subject: 
Author: nogikh@google.com

The bug has actually been already fixed.

#syz invalid

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Subject: 
Author: nogikh@google.com

#syz invalid

The bug is actually no longer present.

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Subject: 
Author: nogikh@google.com

The bug is actually fixed long time ago.

#syz invalid

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Subject: 
Author: daiky0325@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

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Subject: 
Author: halves@igalia.com

#syz test

--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -147,6 +147,7 @@ int dvb_generic_open(struct inode *inode, struct file *file)
                dvbdev->writers--;
        }

+       dvb_device_get(dvbdev);
        dvbdev->users--;
        return 0;
 }
-- 
2.53.0

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Subject: 
Author: klnm1908v@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master

diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 91fd3673c09a..e588a188f50a 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -126,23 +126,10 @@ static enum hrtimer_restart
xen_timer_callback(struct hrtimer *timer)
 {
 	struct kvm_vcpu *vcpu = container_of(timer, struct kvm_vcpu,
 					     arch.xen.timer);
-	struct kvm_xen_evtchn e;
-	int rc;

 	if (atomic_read(&vcpu->arch.xen.timer_pending))
 		return HRTIMER_NORESTART;

-	e.vcpu_id = vcpu->vcpu_id;
-	e.vcpu_idx = vcpu->vcpu_idx;
-	e.port = vcpu->arch.xen.timer_virq;
-	e.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
-
-	rc = kvm_xen_set_evtchn_fast(&e, vcpu->kvm);
-	if (rc != -EWOULDBLOCK) {
-		vcpu->arch.xen.timer_expires = 0;
-		return HRTIMER_NORESTART;
-	}
-
 	atomic_inc(&vcpu->arch.xen.timer_pending);
 	kvm_make_request(KVM_REQ_UNBLOCK, vcpu);
 	kvm_vcpu_kick(vcpu);

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Subject: 
Author: contact@gvernon.com

#syz test

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Subject: 
Author: pimyn@google.com

#syz invalid

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Subject: 
Author: agruenba@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git
4daba9379bbd702c63459f54ef448746bfeab42d

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/minix/inode.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 7897f5123b3d..bee191c50010 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -171,7 +171,15 @@ static bool minix_check_superblock(struct super_block *sb)
 {
 	struct minix_sb_info *sbi = minix_sb(sb);
 
-	if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
+	if (sbi->s_log_zone_size != 0) {
+		printk("minix-fs error: zone size must equal block size. "
+		       "s_log_zone_size > 0 is not supported.\n");
+		return false;
+	}
+
+	if (sbi->s_imap_blocks < 1 || sbi->s_zmap_blocks < 1 ||
+	    sbi->s_ninodes < 1 || sbi->s_firstdatazone <= 4 ||
+	    sbi->s_firstdatazone >= sbi->s_nzones)
 		return false;
 
 	/*
-- 
2.51.2

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Subject: 
Author: eslam.medhat1993@gmail.com

#syz test

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Subject: 
Author: eslam.medhat1993@gmail.com

#syz test

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Subject: 
Author: eslam.medhat1993@gmail.com

#syz test

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Subject: 
Author: eslam.medhat1993@gmail.com

#syz test

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Subject: 
Author: eslam.medhat1993@gmail.com

#syz test

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Subject: 
Author: eslam.medhat1993@gmail.com

#syz test

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Subject: 
Author: jkoolstra@xs4all.nl

#syz dup: WARNING in ntfs_put_super

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#syz test

---

diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 86a6b317b474..ee1760305380 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -196,8 +196,8 @@ static int hfs_create(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, mode);
-	if (!inode)
-		return -ENOMEM;
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
@@ -226,8 +226,8 @@ static struct dentry *hfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 9cd449913dc8..beec6fe7e801 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -186,16 +186,23 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	s64 next_id;
 	s64 file_count;
 	s64 folder_count;
+	int err = -ENOMEM;
 
 	if (!inode)
-		return NULL;
+		goto out_err;
+
+	err = -ENOSPC;
 
 	mutex_init(&HFS_I(inode)->extents_lock);
 	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 	spin_lock_init(&HFS_I(inode)->open_dir_lock);
 	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 	next_id = atomic64_inc_return(&HFS_SB(sb)->next_id);
-	BUG_ON(next_id > U32_MAX);
+	if (next_id > U32_MAX) {
+		pr_err("hfs: next file ID exceeds 32-bit limit — possible "
+		       "superblock corruption");
+		goto out_discard;
+	}
 	inode->i_ino = (u32)next_id;
 	inode->i_mode = mode;
 	inode->i_uid = current_fsuid();
@@ -209,7 +216,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	if (S_ISDIR(mode)) {
 		inode->i_size = 2;
 		folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count);
-		BUG_ON(folder_count > U32_MAX);
+		if (folder_count > U32_MAX) {
+			pr_err("hfs: folder count exceeds 32-bit limit — possible "
+			       "superblock corruption");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_dirs++;
 		inode->i_op = &hfs_dir_inode_operations;
@@ -219,7 +230,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	} else if (S_ISREG(mode)) {
 		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 		file_count = atomic64_inc_return(&HFS_SB(sb)->file_count);
-		BUG_ON(file_count > U32_MAX);
+		if (file_count > U32_MAX) {
+			pr_err("hfs: file count exceeds 32-bit limit — possible "
+			       "superblock corruption");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_files++;
 		inode->i_op = &hfs_file_inode_operations;
@@ -243,6 +258,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	hfs_mark_mdb_dirty(sb);
 
 	return inode;
+
+	out_discard:
+		iput(inode);	
+	out_err:
+		return ERR_PTR(err); 
 }
 
 void hfs_delete_inode(struct inode *inode)
@@ -251,7 +271,6 @@ void hfs_delete_inode(struct inode *inode)
 
 	hfs_dbg("ino %lu\n", inode->i_ino);
 	if (S_ISDIR(inode->i_mode)) {
-		BUG_ON(atomic64_read(&HFS_SB(sb)->folder_count) > U32_MAX);
 		atomic64_dec(&HFS_SB(sb)->folder_count);
 		if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 			HFS_SB(sb)->root_dirs--;
@@ -260,7 +279,6 @@ void hfs_delete_inode(struct inode *inode)
 		return;
 	}
 
-	BUG_ON(atomic64_read(&HFS_SB(sb)->file_count) > U32_MAX);
 	atomic64_dec(&HFS_SB(sb)->file_count);
 	if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 		HFS_SB(sb)->root_files--;
diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index 53f3fae60217..1c3fb631cc8e 100644
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -273,15 +273,12 @@ void hfs_mdb_commit(struct super_block *sb)
 		/* These parameters may have been modified, so write them back */
 		mdb->drLsMod = hfs_mtime();
 		mdb->drFreeBks = cpu_to_be16(HFS_SB(sb)->free_ablocks);
-		BUG_ON(atomic64_read(&HFS_SB(sb)->next_id) > U32_MAX);
 		mdb->drNxtCNID =
 			cpu_to_be32((u32)atomic64_read(&HFS_SB(sb)->next_id));
 		mdb->drNmFls = cpu_to_be16(HFS_SB(sb)->root_files);
 		mdb->drNmRtDirs = cpu_to_be16(HFS_SB(sb)->root_dirs);
-		BUG_ON(atomic64_read(&HFS_SB(sb)->file_count) > U32_MAX);
 		mdb->drFilCnt =
 			cpu_to_be32((u32)atomic64_read(&HFS_SB(sb)->file_count));
-		BUG_ON(atomic64_read(&HFS_SB(sb)->folder_count) > U32_MAX);
 		mdb->drDirCnt =
 			cpu_to_be32((u32)atomic64_read(&HFS_SB(sb)->folder_count));
 
-- 
2.51.1.dirty

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---

diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 86a6b317b474..ee1760305380 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -196,8 +196,8 @@ static int hfs_create(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, mode);
-	if (!inode)
-		return -ENOMEM;
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
@@ -226,8 +226,8 @@ static struct dentry *hfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index fff149af89da..6808b1316b60 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -273,4 +273,6 @@ static inline void hfs_bitmap_dirty(struct super_block *sb)
 	__bh;						\
 })
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 9cd449913dc8..cb74904994cc 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -186,16 +186,22 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	s64 next_id;
 	s64 file_count;
 	s64 folder_count;
+	int err = -ENOMEM;
 
 	if (!inode)
-		return NULL;
+		goto out_err;
+
+	err = -EFSCORRUPTED;
 
 	mutex_init(&HFS_I(inode)->extents_lock);
 	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 	spin_lock_init(&HFS_I(inode)->open_dir_lock);
 	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 	next_id = atomic64_inc_return(&HFS_SB(sb)->next_id);
-	BUG_ON(next_id > U32_MAX);
+	if (next_id > U32_MAX) {
+		printk(KERN_CRIT "hfs error: next file id on super block is corrupt");
+		goto out_discard;
+	}
 	inode->i_ino = (u32)next_id;
 	inode->i_mode = mode;
 	inode->i_uid = current_fsuid();
@@ -209,7 +215,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	if (S_ISDIR(mode)) {
 		inode->i_size = 2;
 		folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count);
-		BUG_ON(folder_count > U32_MAX);
+		if (folder_count > U32_MAX) {
+			printk(KERN_CRIT "hfs error: folder count on super block is corrupt");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_dirs++;
 		inode->i_op = &hfs_dir_inode_operations;
@@ -219,7 +228,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	} else if (S_ISREG(mode)) {
 		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 		file_count = atomic64_inc_return(&HFS_SB(sb)->file_count);
-		BUG_ON(file_count > U32_MAX);
+		if (file_count > U32_MAX) {
+			printk(KERN_CRIT "hfs error: file count on super block is corrupt");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_files++;
 		inode->i_op = &hfs_file_inode_operations;
@@ -243,6 +255,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	hfs_mark_mdb_dirty(sb);
 
 	return inode;
+
+	out_discard:
+		iput(inode);	
+	out_err:
+		return ERR_PTR(err); 
 }
 
 void hfs_delete_inode(struct inode *inode)

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---

diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 86a6b317b474..ee1760305380 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -196,8 +196,8 @@ static int hfs_create(struct mnt_idmap *idmap, struct inode *dir,
        int res;
 
        inode = hfs_new_inode(dir, &dentry->d_name, mode);
-       if (!inode)
-               return -ENOMEM;
+       if (IS_ERR(inode))
+               return PTR_ERR(inode);
 
        res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
        if (res) {
@@ -226,8 +226,8 @@ static struct dentry *hfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
        int res;
 
        inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
-       if (!inode)
-               return ERR_PTR(-ENOMEM);
+       if (IS_ERR(inode))
+               return ERR_CAST(inode);
 
        res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
        if (res) {
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index fff149af89da..6808b1316b60 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -273,4 +273,6 @@ static inline void hfs_bitmap_dirty(struct super_block *sb)
        __bh;                                           \
 })
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 9cd449913dc8..ef46a2d29d6a 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -188,7 +188,7 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
        s64 folder_count;
 
        if (!inode)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
        mutex_init(&HFS_I(inode)->extents_lock);
        INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
@@ -209,7 +209,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
        if (S_ISDIR(mode)) {
                inode->i_size = 2;
                folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count);
-               BUG_ON(folder_count > U32_MAX);
+               if (folder_count > U32_MAX) {
+                       printk(KERN_CRIT "hfs error: folder count on super block is corrupt");
+                       return ERR_PTR(-EFSCORRUPTED);
+               }
                if (dir->i_ino == HFS_ROOT_CNID)
                        HFS_SB(sb)->root_dirs++;
                inode->i_op = &hfs_dir_inode_operations;
@@ -219,7 +222,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
        } else if (S_ISREG(mode)) {
                HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
                file_count = atomic64_inc_return(&HFS_SB(sb)->file_count);
-               BUG_ON(file_count > U32_MAX);
+               if (file_count > U32_MAX) {
+                       printk(KERN_CRIT "hfs error: file count on super block is corrupt");
+                       return ERR_PTR(-EFSCORRUPTED);
+               }
                if (dir->i_ino == HFS_ROOT_CNID)
                        HFS_SB(sb)->root_files++;
                inode->i_op = &hfs_file_inode_operations;

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index a8d5a7e22b7b..f18f7474aca4 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -145,6 +145,12 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
        struct minix_dir_entry * de;
        int err;
 
+       if (inode->i_nlink < 1) {
+               printk(KERN_CRIT "minix-fs error: inode (ino: %ld) "
+                      "has corrupted nlink", inode->i_ino);
+               return -EFSCORRUPTED;
+       }
+
        de = minix_find_entry(dentry, &folio);
        if (!de)
                return -ENOENT;
@@ -218,6 +224,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (new_inode->i_nlink == 0 || (dir_de && new_inode->i_nlink != 2)) {
+                       printk(KERN_CRIT "minix-fs error: inode (ino: %ld) "
+                              "has corrupted nlink", new_inode->i_ino);
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index aae1f32f4dab..f193912d8632 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -704,8 +704,8 @@ static void ntfs_put_super(struct super_block *sb)
        ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
 
        if (sbi->options) {
+               kfree(sbi->options->nls_name);
                unload_nls(sbi->options->nls);
-               kfree(sbi->options->nls);
                kfree(sbi->options);
                sbi->options = NULL;
        }
@@ -1670,8 +1670,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
        iput(inode);
 out:
        if (sbi && sbi->options) {
+               kfree(sbi->options->nls_name);
                unload_nls(sbi->options->nls);
-               kfree(sbi->options->nls);
                kfree(sbi->options);
                sbi->options = NULL;
        }

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---

diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..493a75eff2c9 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -208,6 +218,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (new_inode->i_nlink == 0 || (dir_de && new_inode->i_nlink != 2)) {
+                       printk(KERN_CRIT "minix-fs error: inode (ino: %ld) "
+                              "has corrupted nlink", new_inode->i_ino);
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */

diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index a8d5a7e22b7b..8648d860ef0c 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -218,6 +218,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (dir_de && new_inode->i_nlink != 2) {
+                       printk(KERN_CRIT "minix-fs error: directory inode has "
+                              "corrupted nlink");
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---

diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index a8d5a7e22b7b..8648d860ef0c 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -218,6 +218,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (dir_de && new_inode->i_nlink != 2) {
+                       printk(KERN_CRIT "minix-fs error: directory inode has "
+                              "corrupted nlink");
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/minix/minix.h |  2 ++
 fs/minix/namei.c | 26 ++++++++++++++++++--------
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..a8d5a7e22b7b 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -161,15 +161,25 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
-	int err = -ENOTEMPTY;
-
-	if (minix_empty_dir(inode)) {
-		err = minix_unlink(dir, dentry);
-		if (!err) {
-			inode_dec_link_count(dir);
-			inode_dec_link_count(inode);
-		}
+	int err = -EFSCORRUPTED;
+
+	if (dir->i_nlink <= 2) {
+		printk(KERN_CRIT "minix-fs error: directory inode has "
+		       "corrupted nlink");
+		goto out;
 	}
+
+	err = -ENOTEMPTY;
+	if (!minix_empty_dir(inode))
+		goto out;
+
+	err = minix_unlink(dir, dentry);
+	if (!err) {
+		inode_dec_link_count(dir);
+		inode_dec_link_count(inode);
+ 	}
+
+out:
 	return err;
 }
 
-- 
2.51.1.dirty

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/jfs/jfs_dtree.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 0ab83bb7bbdf..e919de01c42a 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -170,8 +170,8 @@ static void dtGetKey(dtpage_t * p, int i, struct component_name * key,
 static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
 			      int ri, struct component_name * key, int flag);
 
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
-			  ddata_t * data, struct dt_lock **);
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+			 ddata_t * data, struct dt_lock **);
 
 static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
 			struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
@@ -891,7 +891,8 @@ int dtInsert(tid_t tid, struct inode *ip,
 	lv->length = 1;
 	dtlck->index++;
 
-	dtInsertEntry(p, index, name, &data, &dtlck);
+	if (!(rc = dtInsertEntry(p, index, name, &data, &dtlck)))
+		return rc;
 
 	/* linelock stbl of non-root leaf page */
 	if (!(p->header.flag & BT_ROOT)) {
@@ -3625,9 +3626,10 @@ static void dtGetKey(dtpage_t * p, int i,	/* entry index */
  * function: allocate free slot(s) and
  *	     write a leaf/internal entry
  *
- * return: entry slot index
+ * * return: 0 - success;
+ *	   errno - failure;
  */
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 			  ddata_t * data, struct dt_lock ** dtlock)
 {
 	struct dtslot *h, *t;
@@ -3649,6 +3651,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* allocate a free slot */
 	hsi = fsi = p->header.freelist;
+	if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+		jfs_err("Encountered corrupted dtpage before insert");
+		return -EIO;
+	}
 	h = &p->slot[fsi];
 	p->header.freelist = h->next;
 	--p->header.freecnt;
@@ -3697,6 +3703,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 	while (klen) {
 		/* get free slot */
 		fsi = p->header.freelist;
+		if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+			jfs_err("Encountered corrupted dtpage before insert");
+			return -EIO;
+		}
 		t = &p->slot[fsi];
 		p->header.freelist = t->next;
 		--p->header.freecnt;
@@ -3774,6 +3784,8 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* advance next available entry index of stbl */
 	++p->header.nextindex;
+
+	return 0;
 }
 
 
-- 
2.51.1.dirty

Re: Forwarded:

[Al Viro]

On Tue, Oct 28, 2025 at 10:25:20AM -0700, syzbot wrote:
> For archival purposes, forwarding an incoming command email to
> linux-kernel@vger.kernel.org.

For fuck sake, either generate a more useful subject, or take
that to a separate list just for syzbot use.

Do you really intend to end up in a bunch of .procmailrc?

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***

Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/jfs/jfs_dtree.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 0ab83bb7bbdf..e919de01c42a 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -170,8 +170,8 @@ static void dtGetKey(dtpage_t * p, int i, struct component_name * key,
 static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
 			      int ri, struct component_name * key, int flag);
 
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
-			  ddata_t * data, struct dt_lock **);
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+			 ddata_t * data, struct dt_lock **);
 
 static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
 			struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
@@ -891,7 +891,8 @@ int dtInsert(tid_t tid, struct inode *ip,
 	lv->length = 1;
 	dtlck->index++;
 
-	dtInsertEntry(p, index, name, &data, &dtlck);
+	if (!(rc = dtInsertEntry(p, index, name, &data, &dtlck)))
+		return rc;
 
 	/* linelock stbl of non-root leaf page */
 	if (!(p->header.flag & BT_ROOT)) {
@@ -3625,9 +3626,10 @@ static void dtGetKey(dtpage_t * p, int i,	/* entry index */
  * function: allocate free slot(s) and
  *	     write a leaf/internal entry
  *
- * return: entry slot index
+ * * return: 0 - success;
+ *	   errno - failure;
  */
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 			  ddata_t * data, struct dt_lock ** dtlock)
 {
 	struct dtslot *h, *t;
@@ -3649,6 +3651,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* allocate a free slot */
 	hsi = fsi = p->header.freelist;
+	if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+		jfs_err("Encountered corrupted dtpage before insert");
+		return -EIO;
+	}
 	h = &p->slot[fsi];
 	p->header.freelist = h->next;
 	--p->header.freecnt;
@@ -3697,6 +3703,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 	while (klen) {
 		/* get free slot */
 		fsi = p->header.freelist;
+		if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+			jfs_err("Encountered corrupted dtpage before insert");
+			return -EIO;
+		}
 		t = &p->slot[fsi];
 		p->header.freelist = t->next;
 		--p->header.freecnt;
@@ -3774,6 +3784,8 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* advance next available entry index of stbl */
 	++p->header.nextindex;
+
+	return 0;
 }
 
 
-- 
2.51.1.dirty

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 0ab83bb7bbdf..07dd01c79ca2 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -170,8 +170,8 @@ static void dtGetKey(dtpage_t * p, int i, struct component_name * key,
 static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
 			      int ri, struct component_name * key, int flag);
 
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
-			  ddata_t * data, struct dt_lock **);
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+			 ddata_t * data, struct dt_lock **);
 
 static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
 			struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
@@ -891,7 +891,8 @@ int dtInsert(tid_t tid, struct inode *ip,
 	lv->length = 1;
 	dtlck->index++;
 
-	dtInsertEntry(p, index, name, &data, &dtlck);
+	if (!(rc = dtInsertEntry(p, index, name, &data, &dtlck)))
+		return rc;
 
 	/* linelock stbl of non-root leaf page */
 	if (!(p->header.flag & BT_ROOT)) {
@@ -3627,7 +3628,7 @@ static void dtGetKey(dtpage_t * p, int i,	/* entry index */
  *
  * return: entry slot index
  */
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 			  ddata_t * data, struct dt_lock ** dtlock)
 {
 	struct dtslot *h, *t;
@@ -3649,6 +3650,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* allocate a free slot */
 	hsi = fsi = p->header.freelist;
+	if (fsi >= p->header.maxslot) {
+		jfs_err("Encountered corrupted dtpage before insert");
+		return -EIO;
+	}
 	h = &p->slot[fsi];
 	p->header.freelist = h->next;
 	--p->header.freecnt;
@@ -3697,6 +3702,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 	while (klen) {
 		/* get free slot */
 		fsi = p->header.freelist;
+		if (fsi >= p->header.maxslot) {
+			jfs_err("Encountered corrupted dtpage before insert");
+			return -EIO;
+		}
 		t = &p->slot[fsi];
 		p->header.freelist = t->next;
 		--p->header.freecnt;
@@ -3774,6 +3783,8 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* advance next available entry index of stbl */
 	++p->header.nextindex;
+
+	return 0;
 }

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Subject: 
Author: kubik.bartlomiej@gmail.com

#syz test

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Subject: 
Author: zlatistiv@gmail.com

#syz test

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Subject: 
Author: clf700383@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master

From 6dc2deb09faf7d53707cc9e75e175b09644fd181 Mon Sep 17 00:00:00 2001
From: clingfei <clf700383@gmail.com>
Date: Mon, 20 Oct 2025 13:48:54 +0800
Subject: [PATCH] fix integer overflow in set_ipsecrequest

syzbot reported a kernel BUG in set_ipsecrequest() due to an skb_over_panic.

The mp->new_family and mp->old_family is u16, while set_ipsecrequest receives
family as uint8_t,  causing a integer overflow and the later size_req calculation
error, which exceeds the size used in alloc_skb, and ultimately triggered the
kernel bug in skb_put.

Reported-by: syzbot+be97dd4da14ae88b6ba4@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=be97dd4da14ae88b6ba4
Signed-off-by: Cheng Lingfei <clf700383@gmail.com>
---
 net/key/af_key.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 2ebde0352245..08f4cde01994 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3518,7 +3518,7 @@ static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *
 
 static int set_ipsecrequest(struct sk_buff *skb,
 			    uint8_t proto, uint8_t mode, int level,
-			    uint32_t reqid, uint8_t family,
+			    uint32_t reqid, uint16_t family,
 			    const xfrm_address_t *src, const xfrm_address_t *dst)
 {
 	struct sadb_x_ipsecrequest *rq;
-- 
2.34.1

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/minix/inode.c | 14 ++++++++++++++
 fs/minix/namei.c | 22 ++++++++++++++--------
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index f007e389d5d2..e27907fc9bf2 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -517,6 +517,13 @@ static struct inode *V1_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
@@ -555,6 +562,13 @@ static struct inode *V2_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..8297ee6651a1 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -161,15 +161,21 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
-	int err = -ENOTEMPTY;
-
-	if (minix_empty_dir(inode)) {
-		err = minix_unlink(dir, dentry);
-		if (!err) {
-			inode_dec_link_count(dir);
-			inode_dec_link_count(inode);
-		}
+	int err = -EIO;
+
+	if (dir->i_nlink <= 2)
+		goto out;
+
+	err = -ENOTEMPTY;
+	if (!minix_empty_dir(inode))
+		goto out;
+
+	err = minix_unlink(dir, dentry);
+	if (!err) {
+		inode_dec_link_count(dir);
+		inode_dec_link_count(inode);
 	}
+out:
 	return err;
 }
 
-- 
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#syz test

---
 fs/minix/inode.c | 14 ++++++++++++++
 fs/minix/namei.c | 22 ++++++++++++++--------
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index f007e389d5d2..e27907fc9bf2 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -517,6 +517,13 @@ static struct inode *V1_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
@@ -555,6 +562,13 @@ static struct inode *V2_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..8297ee6651a1 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -161,15 +161,21 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
-	int err = -ENOTEMPTY;
-
-	if (minix_empty_dir(inode)) {
-		err = minix_unlink(dir, dentry);
-		if (!err) {
-			inode_dec_link_count(dir);
-			inode_dec_link_count(inode);
-		}
+	int err = -EIO;
+
+	if (dir->i_nlink <= 2)
+		goto out;
+
+	err = -ENOTEMPTY;
+	if (!minix_empty_dir(inode))
+		goto out;
+
+	err = minix_unlink(dir, dentry);
+	if (!err) {
+		inode_dec_link_count(dir);
+		inode_dec_link_count(inode);
 	}
+out:
 	return err;
 }
 
-- 
2.51.0

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#syz test

---
fs/minix/namei.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..86779a6ec1a7 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -224,7 +224,7 @@ static int minix_rename(struct mnt_idmap *idmap,
err = minix_add_link(new_dentry, old_inode);
if (err)
goto out_dir;
- if (dir_de)
+ if (dir_de && old_dir != new_dir)
inode_inc_link_count(new_dir);
}
@@ -236,7 +236,7 @@ static int minix_rename(struct mnt_idmap *idmap,
if (dir_de) {
err = minix_set_link(dir_de, dir_folio, new_dir);
- if (!err)
+ if (!err && (new_inode || old_dir != new_dir))
inode_dec_link_count(old_dir);
}
out_dir:
-- 
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#syz test

---
 fs/jfs/namei.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 65a218eba8fa..7879c049632b 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1228,7 +1228,7 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 				jfs_err("jfs_rename: dtInsert returned -EIO");
 			goto out_tx;
 		}
-		if (S_ISDIR(old_ip->i_mode))
+		if (S_ISDIR(old_ip->i_mode) && old_dir != new_dir)
 			inc_nlink(new_dir);
 	}
 	/*
@@ -1244,7 +1244,9 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		goto out_tx;
 	}
 	if (S_ISDIR(old_ip->i_mode)) {
-		drop_nlink(old_dir);
+		if (new_ip || old_dir != new_dir)
+			drop_nlink(old_dir);
+
 		if (old_dir != new_dir) {
 			/*
 			 * Change inode number of parent for moved directory
-- 
2.51.0

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#syz test

---
 fs/jfs/namei.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 65a218eba8fa..37cd16a423c5 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1228,7 +1228,7 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 				jfs_err("jfs_rename: dtInsert returned -EIO");
 			goto out_tx;
 		}
-		if (S_ISDIR(old_ip->i_mode))
+		if (S_ISDIR(old_ip->i_mode) && old_dir != new_dir)
 			inc_nlink(new_dir);
 	}
 	/*
@@ -1244,8 +1244,9 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		goto out_tx;
 	}
 	if (S_ISDIR(old_ip->i_mode)) {
-		drop_nlink(old_dir);
 		if (old_dir != new_dir) {
+			drop_nlink(old_dir);
+
 			/*
 			 * Change inode number of parent for moved directory
 			 */
-- 
2.51.0

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Subject: 
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#syz test


 fs/ntfs3/index.c | 10 +++++-----
 fs/ntfs3/ntfs.h  |  5 ++++-
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c
index 6d1bf890929d..2e512abc7000 100644
--- a/fs/ntfs3/index.c
+++ b/fs/ntfs3/index.c
@@ -1808,7 +1808,7 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
 	CLST new_vbn;
 	__le64 t_vbn, *sub_vbn;
 	u16 sp_size;
-	void *hdr1_saved = NULL;
+	void *blk1_saved = NULL;
 
 	/* Try the most easy case. */
 	e = fnd->level - 1 == level ? fnd->de[level] : NULL;
@@ -1842,8 +1842,8 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
 	memcpy(up_e, sp, sp_size);
 
 	used1 = le32_to_cpu(hdr1->used);
-	hdr1_saved = kmemdup(hdr1, used1, GFP_NOFS);
-	if (!hdr1_saved) {
+	blk1_saved = kmemdup(&n1->index->blk, used1, GFP_NOFS);
+	if (!blk1_saved) {
 		err = -ENOMEM;
 		goto out;
 	}
@@ -1924,13 +1924,13 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
 		 * Undo critical operations.
 		 */
 		indx_mark_free(indx, ni, new_vbn >> indx->idx2vbn_bits);
-		memcpy(hdr1, hdr1_saved, used1);
+		memcpy(&n1->index->blk, blk1_saved, used1);
 		indx_write(indx, ni, n1, 0);
 	}
 
 out:
 	kfree(up_e);
-	kfree(hdr1_saved);
+	kfree(blk1_saved);
 
 	return err;
 }
diff --git a/fs/ntfs3/ntfs.h b/fs/ntfs3/ntfs.h
index 552b97905813..d5e2b22eacd7 100644
--- a/fs/ntfs3/ntfs.h
+++ b/fs/ntfs3/ntfs.h
@@ -754,7 +754,10 @@ static inline bool hdr_has_subnode(const struct INDEX_HDR *hdr)
 struct INDEX_BUFFER {
 	struct NTFS_RECORD_HEADER rhdr; // 'INDX'
 	__le64 vbn; // 0x10: vcn if index >= cluster or vsn id index < cluster
-	struct INDEX_HDR ihdr; // 0x18:
+	struct_group(blk,
+		struct INDEX_HDR ihdr; // 0x18:
+	        u8 data[]; // NTFS_DE entries
+	);
 };
 
 static_assert(sizeof(struct INDEX_BUFFER) == 0x28);
-- 
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Subject: 
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#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

Resending this patch in the existing thread with a '#syz test:' directive
so syzbot can test it.

From 1bb35c6722b8fb03e9262f6e6530d240629a44df Mon Sep 17 00:00:00 2001
From: neqbal <nooraineqbal@gmail.com>
Date: Sun, 28 Sep 2025 03:52:44 +0530
Subject: [PATCH] x86/mm: Fix off-by-one error in set_memory

Correct end page calculation by subtracting 1 to prevent
out-of-bounds access.

Reported-by: syzbot+e34177f6091df113ef20@syzkaller.appspotmail.com
Signed-off-by: neqbal <nooraineqbal@gmail.com>
---
 arch/x86/mm/pat/set_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index d2d54b8c4dbb..daefc96403f1 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -446,7 +446,7 @@ static void cpa_flush(struct cpa_data *cpa, int cache)
 	}
 
 	start = fix_addr(__cpa_addr(cpa, 0));
-	end =   fix_addr(__cpa_addr(cpa, cpa->numpages));
+	end =   fix_addr(__cpa_addr(cpa, cpa->numpages - 1));
 	if (cpa->force_flush_all)
 		end = TLB_FLUSH_ALL;
 
-- 
2.51.0

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#syz test

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 26d6c1eea559..a879e8030568 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -760,7 +760,7 @@ static int compute_bitstructs(struct gfs2_rgrpd *rgd)
        u32 bytes_left, bytes;
        int x;

-       if (!length)
+       if (!length || length > KMALLOC_MAX_SIZE / sizeof(struct
gfs2_bitmap))
                return -EINVAL;

        rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap),
GFP_NOFS);

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#syz test

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#syz invalid

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no longer relevant

#syz invalid

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No longer relevant
#syz invalid

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Subject: 
Author: abinashsinghlalotra@gmail.com

#syz test

--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -33,6 +33,12 @@ static int ovl_cleanup_locked(struct dentry *workdir,
struct dentry *dentry)
        struct inode *dir = d_inode(workdir);
        struct inode *inode = d_inode(dentry);

+ /* Avoid unlinking an already unlinked inode */
+ if (inode && inode->i_nlink == 0) {
+ d_drop(dentry);
+ return 0;
+ }
+
        if (ovl_is_whiteout(dentry))
                return ovl_remove_and_whiteout(workdir, dentry, true);

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#syz test

--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -872,6 +872,11 @@ static int ax88772_bind(struct usbnet *dev, struct
usb_interface *intf)
        if (ret < 0)
                return ret;

+ if (ret >= 32) {
+ netdev_warn(dev->net, "Invalid PHY address %d, clamping\n", ret);
+ return -EINVAL;
+ }
+
        priv->phy_addr = ret;
        priv->embd_phy = ((priv->phy_addr & 0x1f) == AX_EMBD_PHY_ADDR);


--

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#syz fix: bcachefs: Don't lock inode around page_symlink

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#syz fix:  bcachefs: Ignore accounting key type larger than BCH_DISK_ACCOUNTING_TYPE_NR

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#syz fix: bcachefs: Fix incorrect transaction handling

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#syz fix: bcachefs: btree_check_root_boundaries()

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#syz fix:  bcachefs: Add missing ei_last_dirtied update

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#syz fix: mm: memory: extend finish_fault() to support large folio

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#syz set subsystems: block fs

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#syz fix:  bcachefs: journal_entry_btree_keys_to_text() is more careful

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#syz fix:  bcachefs: fix the memory leak in exception case

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Subject: 
Author: kent.overstreet@linux.dev

#syz fix: bcachefs: Fix __bch2_alloc_to_v4 copy

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Subject: 
Author: kent.overstreet@linux.dev

#syz fix: bcachefs: fix assert in bch2_btree_path_traverse_cached()

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Subject: 
Author: kent.overstreet@linux.dev

#syz fix: bcachefs: Move bset size check before csum check

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Subject: 
Author: purvayeshi550@gmail.com

#syz test

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Subject: 
Author: purvayeshi550@gmail.com

#syz test

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Subject: 
Author: purvayeshi550@gmail.com

#syz test