* [syzbot] [nfc?] KASAN: slab-out-of-bounds Read in pn533_recv_frame
@ 2026-10-12 17:44 syzbot
2026-11-05 8:23 ` syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-10-12 17:44 UTC (permalink / raw)
To: david, krzk, linux-kernel, netdev, oe-linux-nfc, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 3857c2fe5449 Merge tag 'pci-v7.3-fixes-4' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15fd0c9c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=129d675874dbf896
dashboard link: https://syzkaller.appspot.com/bug?extid=93f169a8e7d66864f800
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/37e6727f8862/disk-3857c2fe.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1f8dc1f69ff6/vmlinux-3857c2fe.xz
kernel image: https://storage.googleapis.com/syzbot-assets/73081d5a798a/bzImage-3857c2fe.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+93f169a8e7d66864f800@syzkaller.appspotmail.com
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
BUG: KASAN: slab-out-of-bounds in hex_dump_to_buffer+0xbc4/0xc60 lib/hexdump.c:194
Read of size 1 at addr ffff88804551ba00 by task syz.0.691/10352
CPU: 0 UID: 0 PID: 10352 Comm: syz.0.691 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x13d/0x4b0 mm/kasan/report.c:482
kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
hex_dump_to_buffer+0xbc4/0xc60 lib/hexdump.c:194
print_hex_dump+0x14a/0x1f0 lib/hexdump.c:277
pn533_recv_frame+0x48e/0x6d0 drivers/nfc/pn533/pn533.c:2202
__usb_hcd_giveback_urb+0x38e/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
dummy_timer+0xdaf/0x3820 drivers/usb/gadget/udc/dummy_hcd.c:2023
__run_hrtimer kernel/time/hrtimer.c:2074 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2131
hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2148
handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:filter_irq_stacks+0x19/0x90 kernel/stacktrace.c:397
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 85 f6 74 61 53 31 c0 48 bb 00 00 00 00 00 fc ff df 48 83 ec 10 <48> 89 fa 48 c1 ea 03 80 3c 1a 00 75 4a 48 8b 17 48 81 fa 30 02 00
RSP: 0018:ffffc9000416f820 EFLAGS: 00000206
RAX: 0000000000000005 RBX: dffffc0000000000 RCX: 0000000000000001
RDX: ffffffff8274594b RSI: 000000000000000f RDI: ffffc9000416f8c0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc9000416f898
R13: ffffffff84dfe5d7 R14: 0000000001422008 R15: ffffea0000d96540
stack_depot_save_flags+0x27/0x9f0 lib/stackdepot.c:667
kasan_save_stack+0x3f/0x50 mm/kasan/common.c:58
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:264 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2748 [inline]
slab_free mm/slub.c:6509 [inline]
kfree+0x22b/0x6d0 mm/slub.c:6802
selinux_release_secctx security/selinux/hooks.c:7111 [inline]
selinux_release_secctx+0x87/0x110 security/selinux/hooks.c:7108
security_release_secctx+0x7c/0x120 security/security.c:3992
audit_log_subj_ctx+0x3a9/0x450 kernel/audit.c:2324
audit_log_task_context+0x7f/0xb0 kernel/audit.c:2367
audit_log_task+0x1b7/0x3a0 kernel/auditsc.c:2902
audit_seccomp+0x7a/0x1f0 kernel/auditsc.c:2952
seccomp_log kernel/seccomp.c:1048 [inline]
__seccomp_filter+0x88c/0x1130 kernel/seccomp.c:1342
__seccomp_permit_syscall+0x224/0x2e0 kernel/seccomp.c:1402
syscall_trace_enter include/linux/entry-common.h:98 [inline]
syscall_enter_from_user_mode_work include/linux/entry-common.h:147 [inline]
do_syscall_64+0x591/0x790 arch/x86/entry/syscall_64.c:81
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f219af5ea0e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f219bebaf38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f219bebc6c0 RCX: 00007f219af5ea0e
RDX: 00007f219bebaf90 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000000c0
R13: 0000000000000000 R14: 00007f219b225fa0 R15: 00007ffc2e7b6028
</TASK>
Allocated by task 10352:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5068
kmalloc_reserve+0x148/0x350 net/core/skbuff.c:615
__alloc_skb+0x185/0x710 net/core/skbuff.c:715
alloc_skb include/linux/skbuff.h:1384 [inline]
pn533_recv_response+0x100/0x200 drivers/nfc/pn533/usb.c:65
__usb_hcd_giveback_urb+0x38e/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
dummy_timer+0xdaf/0x3820 drivers/usb/gadget/udc/dummy_hcd.c:2023
__run_hrtimer kernel/time/hrtimer.c:2074 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2131
hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2148
handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
The buggy address belongs to the object at ffff88804551b740
which belongs to the cache skbuff_small_head of size 704
The buggy address is located 0 bytes to the right of
allocated 704-byte region [ffff88804551b740, ffff88804551ba00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x45518
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88814040b780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000200130013 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88814040b780 dead000000000100 dead000000000122
head: 0000000000000000 0000000200130013 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1108, tgid 1108 (kworker/u8:8), ts 286234767687
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
alloc_slab_page mm/slub.c:3347 [inline]
allocate_slab mm/slub.c:3462 [inline]
new_slab+0xa9/0x6e0 mm/slub.c:3513
refill_objects+0xe3/0x410 mm/slub.c:7418
refill_sheaf mm/slub.c:2885 [inline]
__pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
alloc_from_pcs mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:4984 [inline]
kmem_cache_alloc_node_noprof+0x4f2/0x6e0 mm/slub.c:5068
kmalloc_reserve+0x148/0x350 net/core/skbuff.c:615
__alloc_skb+0x185/0x710 net/core/skbuff.c:715
alloc_skb include/linux/skbuff.h:1384 [inline]
nlmsg_new include/net/netlink.h:1055 [inline]
inet6_ifmcaddr_notify+0xd6/0x1d0 net/ipv6/mcast.c:928
__ipv6_dev_mc_inc+0x731/0xc80 net/ipv6/mcast.c:993
addrconf_join_solict net/ipv6/addrconf.c:2262 [inline]
addrconf_dad_begin net/ipv6/addrconf.c:4135 [inline]
addrconf_dad_work+0x276/0x1360 net/ipv6/addrconf.c:4263
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
page last free pid 4956 tgid 4956 ts 286222916440 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5068
__alloc_skb+0x140/0x710 net/core/skbuff.c:704
alloc_skb include/linux/skbuff.h:1384 [inline]
alloc_skb_with_frags+0xdd/0x760 net/core/skbuff.c:6803
sock_alloc_send_pskb+0x801/0x980 net/core/sock.c:3022
unix_dgram_sendmsg+0x3c7/0x1810 net/unix/af_unix.c:2144
sock_sendmsg_nosec net/socket.c:800 [inline]
__sock_sendmsg net/socket.c:815 [inline]
__sys_sendto+0x48b/0x4e0 net/socket.c:2281
__do_sys_sendto net/socket.c:2288 [inline]
__se_sys_sendto net/socket.c:2284 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88804551b900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88804551b980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804551ba00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88804551ba80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804551bb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: f3 0f 1e fa endbr64
15: 85 f6 test %esi,%esi
17: 74 61 je 0x7a
19: 53 push %rbx
1a: 31 c0 xor %eax,%eax
1c: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
23: fc ff df
26: 48 83 ec 10 sub $0x10,%rsp
* 2a: 48 89 fa mov %rdi,%rdx <-- trapping instruction
2d: 48 c1 ea 03 shr $0x3,%rdx
31: 80 3c 1a 00 cmpb $0x0,(%rdx,%rbx,1)
35: 75 4a jne 0x81
37: 48 8b 17 mov (%rdi),%rdx
3a: 48 rex.W
3b: 81 .byte 0x81
3c: fa cli
3d: 30 02 xor %al,(%rdx)
---
This report is generated by a bot. It may contain errors.
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syzbot will keep track of this issue. See:
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If you want to overwrite report's subsystems, reply with:
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [nfc?] KASAN: slab-out-of-bounds Read in pn533_recv_frame
2026-10-12 17:44 [syzbot] [nfc?] KASAN: slab-out-of-bounds Read in pn533_recv_frame syzbot
@ 2026-11-05 8:23 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-11-05 8:23 UTC (permalink / raw)
To: chandradhar.2003, david, krzk, linux-kernel, michael.thalmeier,
netdev, oe-linux-nfc, sameo, shreeramrahul94, syzkaller-bugs
syzbot has found a reproducer for the following issue on:
HEAD commit: 8b7179210b22 Add linux-next specific files for 20261104
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1472fca1580000
kernel config: https://syzkaller.appspot.com/x/.config?x=5dad87d6a9d5ee90
dashboard link: https://syzkaller.appspot.com/bug?extid=93f169a8e7d66864f800
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1641aca1580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c09edd580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/24dabb992a55/disk-8b717921.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/efb6c59219d5/vmlinux-8b717921.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ced4d906c236/bzImage-8b717921.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+93f169a8e7d66864f800@syzkaller.appspotmail.com
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PN533 RX: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
BUG: KASAN: slab-out-of-bounds in hex_dump_to_buffer+0x36c/0xd70 lib/hexdump.c:194
Read of size 1 at addr ffff888027737a00 by task swapper/1/0
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
<IRQ>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
hex_dump_to_buffer+0x36c/0xd70 lib/hexdump.c:194
print_hex_dump+0x16b/0x2b0 lib/hexdump.c:277
pn533_recv_frame+0x5f6/0x6d0 drivers/nfc/pn533/pn533.c:2202
__usb_hcd_giveback_urb+0x378/0x540 drivers/usb/core/hcd.c:1658
dummy_timer+0xa9a/0x4ce0 drivers/usb/gadget/udc/dummy_hcd.c:2051
__run_hrtimer kernel/time/hrtimer.c:2079 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2136
hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2153
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
__do_softirq kernel/softirq.c:703 [inline]
invoke_softirq kernel/softirq.c:542 [inline]
__irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786
irq_exit_rcu+0x9/0x30 kernel/softirq.c:809
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1073 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1073
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:finish_task_switch+0x413/0xc60 kernel/sched/core.c:5434
Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 c7 56 89 0a e8 22 92 3a 00 fb 4c 8b 65 c8 <49> 8d bc 24 18 17 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc900001c7be0 EFLAGS: 00000206
RAX: 000000000008812b RBX: ffff8880b833d3a0 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8e9ef560 RDI: ffffffff8cb01080
RBP: ffffc900001c7c30 R08: ffffffff91e104bf R09: 1ffffffff23c2097
R10: dffffc0000000000 R11: fffffbfff23c2098 R12: ffff88801fa99f40
R13: ffff88801fa99f40 R14: dffffc0000000000 R15: 1ffff11017067a74
context_switch kernel/sched/core.c:5586 [inline]
__schedule+0x17e5/0x5830 kernel/sched/core.c:7382
schedule_idle+0x51/0x90 kernel/sched/core.c:7500
do_idle+0x4ad/0x540 kernel/sched/idle.c:384
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:458
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x157
</TASK>
Allocated by task 0:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3f/0x90 mm/kasan/common.c:79
unpoison_slab_object mm/kasan/common.c:354 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:380
kasan_slab_alloc include/linux/kasan.h:257 [inline]
slab_post_alloc_hook mm/slub.c:4716 [inline]
slab_alloc_node mm/slub.c:5029 [inline]
kmem_cache_alloc_node_noprof+0x34f/0x600 mm/slub.c:5101
kmalloc_reserve net/core/skbuff.c:616 [inline]
__alloc_skb+0x27a/0x7a0 net/core/skbuff.c:716
alloc_skb include/linux/skbuff.h:1390 [inline]
pn533_recv_response+0xc4/0x230 drivers/nfc/pn533/usb.c:65
__usb_hcd_giveback_urb+0x378/0x540 drivers/usb/core/hcd.c:1658
dummy_timer+0xa9a/0x4ce0 drivers/usb/gadget/udc/dummy_hcd.c:2051
__run_hrtimer kernel/time/hrtimer.c:2079 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2136
hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2153
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
__do_softirq kernel/softirq.c:703 [inline]
invoke_softirq kernel/softirq.c:542 [inline]
__irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786
irq_exit_rcu+0x9/0x30 kernel/softirq.c:809
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1073 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1073
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
The buggy address belongs to the object at ffff888027737740
which belongs to the cache skbuff_small_head of size 704
The buggy address is located 0 bytes to the right of
allocated 704-byte region [ffff888027737740, ffff888027737a00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27734
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff888140a9bdc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000200130013 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff888140a9bdc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000200130013 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5650, tgid 5650 (syz-executor223), ts 84263979260
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1874
prep_new_page+0x22/0xb0 mm/page_alloc.c:1882
get_page_from_freelist+0x22a1/0x22e0 mm/page_alloc.c:3964
__alloc_frozen_pages_noprof+0x211/0x450 mm/page_alloc.c:5506
alloc_slab_page mm/slub.c:3382 [inline]
allocate_slab+0x7d/0x5e0 mm/slub.c:3497
new_slab mm/slub.c:3548 [inline]
refill_objects+0x2d5/0x350 mm/slub.c:7522
refill_sheaf mm/slub.c:2915 [inline]
__pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4807
alloc_from_pcs mm/slub.c:4883 [inline]
slab_alloc_node mm/slub.c:5017 [inline]
kmem_cache_alloc_node_noprof+0x432/0x600 mm/slub.c:5101
kmalloc_reserve net/core/skbuff.c:616 [inline]
__alloc_skb+0x27a/0x7a0 net/core/skbuff.c:716
napi_alloc_skb+0x86/0xaf0 net/core/skbuff.c:856
page_to_skb+0x240/0x1780 drivers/net/virtio_net.c:880
receive_mergeable drivers/net/virtio_net.c:2426 [inline]
receive_buf+0x720/0x1b60 drivers/net/virtio_net.c:2596
virtnet_receive_packets drivers/net/virtio_net.c:2921 [inline]
virtnet_receive drivers/net/virtio_net.c:2945 [inline]
virtnet_poll+0x22bf/0x3100 drivers/net/virtio_net.c:3040
__napi_poll+0xaa/0x330 net/core/dev.c:7985
napi_poll net/core/dev.c:8048 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8205
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
page last free pid 5317 tgid 5317 ts 54559667751 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1416 [inline]
__free_frozen_pages+0xd1a/0xe10 mm/page_alloc.c:2972
__slab_free+0x269/0x2c0 mm/slub.c:5922
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:364
kasan_slab_alloc include/linux/kasan.h:257 [inline]
slab_post_alloc_hook mm/slub.c:4716 [inline]
slab_alloc_node mm/slub.c:5029 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5043
vm_area_alloc+0x24/0x140 mm/vma_init.c:36
__mmap_new_vma mm/vma.c:2765 [inline]
__mmap_region mm/vma.c:3119 [inline]
mmap_region+0x18e8/0x2820 mm/vma.c:3201
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x27a/0x520 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888027737900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888027737980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888027737a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888027737a80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888027737b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 00 00 add %al,(%rax)
2: 41 c7 84 24 20 0e 00 movl $0x0,0xe20(%r12)
9: 00 00 00 00 00
e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
13: 49 83 c4 48 add $0x48,%r12
17: 4c 89 e7 mov %r12,%rdi
1a: e8 c7 56 89 0a call 0xa8956e6
1f: e8 22 92 3a 00 call 0x3a9246
24: fb sti
25: 4c 8b 65 c8 mov -0x38(%rbp),%r12
* 29: 49 8d bc 24 18 17 00 lea 0x1718(%r12),%rdi <-- trapping instruction
30: 00
31: 48 89 f8 mov %rdi,%rax
34: 48 c1 e8 03 shr $0x3,%rax
38: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax
3d: 84 c0 test %al,%al
---
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-10-12 17:44 [syzbot] [nfc?] KASAN: slab-out-of-bounds Read in pn533_recv_frame syzbot
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