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2002:a05:6808:1599:b0:4cb:d056:b14f with SMTP id 5614622812f47-4dc57e2b419mr5560159b6e.1.1790453578422; Sat, 26 Sep 2026 13:12:58 -0700 (PDT) Date: Sat, 26 Sep 2026 13:12:58 -0700 In-Reply-To: <20260924070410.2629558-1-benquike@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab8274a.80e1c6cc.1e8e5f.004a.GAE@google.com> Subject: [syzbot ci] Re: hfs: validate allocation block parameters in hfs_mdb_get() From: syzbot ci To: benquike@gmail.com, frank.li@vivo.com, glaubitz@physik.fu-berlin.de, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, slava@dubeyko.com, stable@vger.kernel.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v2] hfs: validate allocation block parameters in hfs_mdb_get() https://lore.kernel.org/all/20260924070410.2629558-1-benquike@gmail.com * [PATCH v2] hfs: validate allocation block parameters in hfs_mdb_get() and found the following issue: KASAN: invalid-free in hfs_mdb_put Full report is available here: https://ci.syzbot.org/series/cf0561b3-479e-4e81-9209-dcf5e7c97d22 *** KASAN: invalid-free in hfs_mdb_put tree: vfs URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/vfs/vfs.git base: 84086827932b58e7645d93d970bbc566c4ee408b arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/23fc2a96-ed2b-4fed-8d8d-653b871c6c0f/config syz repro: https://ci.syzbot.org/findings/d2c81756-7cff-47d8-b984-468d9efaef7b/syz_repro loop1: detected capacity change from 0 to 64 hfs: inconsistent allocation block parameters in MDB hfs: can't find a HFS filesystem on dev loop1 ================================================================== BUG: KASAN: double-free in hfs_mdb_put+0x15b/0x270 fs/hfs/mdb.c:467 Free of addr ffff888117e9bc00 by task syz.1.18/5837 CPU: 0 UID: 0 PID: 5837 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: 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_invalid_free+0xea/0x110 mm/kasan/report.c:557 check_slab_allocation mm/kasan/common.c:-1 [inline] __kasan_slab_pre_free+0x104/0x120 mm/kasan/common.c:261 kasan_slab_pre_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:2693 [inline] slab_free mm/slub.c:6508 [inline] kfree+0x173/0x650 mm/slub.c:6801 hfs_mdb_put+0x15b/0x270 fs/hfs/mdb.c:467 hfs_fill_super+0x4d2/0x7b0 fs/hfs/super.c:403 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1897 vfs_get_tree+0x92/0x2a0 fs/super.c:1957 fc_mount fs/namespace.c:1209 [inline] do_new_mount_fc fs/namespace.c:3785 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3861 do_mount fs/namespace.c:4194 [inline] __do_sys_mount fs/namespace.c:4408 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4385 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0f2619f3ca Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0f27037e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f0f27037ee0 RCX: 00007f0f2619f3ca RDX: 0000200000000180 RSI: 00002000000000c0 RDI: 00007f0f27037ea0 RBP: 0000200000000180 R08: 00007f0f27037ee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000000c0 R13: 00007f0f27037ea0 R14: 0000000000000305 R15: 0000200000001800 Allocated by task 5837: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5414 [inline] __kmalloc_node_track_caller_noprof+0x4b4/0x720 mm/slub.c:5545 kmemdup_noprof+0x2b/0x70 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:715 [inline] hfs_mdb_get+0x895/0x2350 fs/hfs/mdb.c:194 hfs_fill_super+0x482/0x7b0 fs/hfs/super.c:352 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1897 vfs_get_tree+0x92/0x2a0 fs/super.c:1957 fc_mount fs/namespace.c:1209 [inline] do_new_mount_fc fs/namespace.c:3785 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3861 do_mount fs/namespace.c:4194 [inline] __do_sys_mount fs/namespace.c:4408 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4385 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5837: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6508 [inline] kfree+0x1c5/0x650 mm/slub.c:6801 hfs_mdb_put+0x15b/0x270 fs/hfs/mdb.c:467 hfs_mdb_get+0x1935/0x2350 fs/hfs/mdb.c:318 hfs_fill_super+0x482/0x7b0 fs/hfs/super.c:352 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1897 vfs_get_tree+0x92/0x2a0 fs/super.c:1957 fc_mount fs/namespace.c:1209 [inline] do_new_mount_fc fs/namespace.c:3785 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3861 do_mount fs/namespace.c:4194 [inline] __do_sys_mount fs/namespace.c:4408 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4385 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888117e9bc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff888117e9bc00, ffff888117e9be00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888117e9b400 pfn:0x117e98 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x17ff00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 017ff00000000240 ffff888100041c80 ffffea00045caa10 ffffea000440b710 raw: ffff888117e9b400 000000000010000c 00000000f5000000 0000000000000000 head: 017ff00000000240 ffff888100041c80 ffffea00045caa10 ffffea000440b710 head: ffff888117e9b400 000000000010000c 00000000f5000000 0000000000000000 head: 017ff00000000002 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5611, tgid 5611 (syz-executor), ts 59180259569 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7417 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __kmalloc_cache_noprof+0x39b/0x600 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] device_private_init drivers/base/core.c:3606 [inline] device_add+0xb6/0xb80 drivers/base/core.c:3657 netdev_register_kobject+0x197/0x350 net/core/net-sysfs.c:2340 register_netdevice+0x1433/0x1eb0 net/core/dev.c:11503 __ip_tunnel_create+0x3e8/0x550 net/ipv4/ip_tunnel.c:268 ip_tunnel_init_net+0x2e5/0x820 net/ipv4/ip_tunnel.c:1137 ops_init+0x35d/0x5d0 net/core/net_namespace.c:137 setup_net+0x118/0x350 net/core/net_namespace.c:443 copy_net_ns+0x53b/0x780 net/core/net_namespace.c:582 create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132 page last free pid 5575 tgid 5575 ts 47941916741 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __slab_free+0x274/0x2c0 mm/slub.c:5823 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:350 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_noprof+0x2b9/0x600 mm/slub.c:5010 alloc_buffer_head+0x2a/0x280 fs/buffer.c:2881 folio_alloc_buffers+0x1a4/0x630 fs/buffer.c:749 create_empty_buffers+0x3a/0x520 fs/buffer.c:1587 ext4_block_write_begin+0x610/0x1560 fs/ext4/inode.c:1193 ext4_da_write_begin+0x879/0xd70 fs/ext4/inode.c:3167 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4374 ext4_buffered_write_iter+0xd4/0x380 fs/ext4/file.c:354 ext4_file_write_iter+0xae4/0x1cd0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 Memory state around the buggy address: ffff888117e9bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888117e9bb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888117e9bc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888117e9bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888117e9bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported.