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UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry

Status: upstream: reported C repro on 2025/12/11 06:22
Subsystems: ocfs2
[Documentation on labels]
Reported-by: syzbot+cf96bc82a588a27346a8@syzkaller.appspotmail.com
First crash: 3d15h, last: 2d10h
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ocfs2?] UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry 0 (2) 2025/12/11 11:51
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/12/11 11:51 21m dmantipov@yandex.ru patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d358e5254674b70f34c847715ca509e46eb81e6f OK log

Sample crash report:
=======================================================
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/ocfs2/xattr.c:1955:3
index 2 is out of range for type 'struct ocfs2_xattr_entry[] __counted_by(xh_count)' (aka 'struct ocfs2_xattr_entry[]')
CPU: 0 UID: 0 PID: 5508 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455
 ocfs2_xa_remove_entry+0x36d/0x3e0 fs/ocfs2/xattr.c:1955
 ocfs2_xa_remove fs/ocfs2/xattr.c:2043 [inline]
 ocfs2_xa_set+0xaf4/0x2a70 fs/ocfs2/xattr.c:2247
 ocfs2_xattr_block_set+0x3ca/0x31b0 fs/ocfs2/xattr.c:2985
 __ocfs2_xattr_set_handle+0x27e/0xf20 fs/ocfs2/xattr.c:-1
 ocfs2_xattr_set+0xde8/0x11f0 fs/ocfs2/xattr.c:3650
 __vfs_removexattr+0x431/0x470 fs/xattr.c:518
 __vfs_removexattr_locked+0x1e8/0x230 fs/xattr.c:553
 vfs_removexattr+0x80/0x1b0 fs/xattr.c:575
 removexattr fs/xattr.c:1023 [inline]
 filename_removexattr fs/xattr.c:1052 [inline]
 path_removexattrat+0x35d/0x690 fs/xattr.c:1088
 __do_sys_lremovexattr fs/xattr.c:1106 [inline]
 __se_sys_lremovexattr fs/xattr.c:1103 [inline]
 __x64_sys_lremovexattr+0x65/0x80 fs/xattr.c:1103
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f65fcd8f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007ffc4fa4bdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6
RAX: ffffffffffffffda RBX: 00007f65fcfe5fa0 RCX: 00007f65fcd8f7c9
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000200000000240
RBP: 00007f65fce13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f65fcfe5fa0 R14: 00007f65fcfe5fa0 R15: 0000000000000002
 </TASK>
---[ end trace ]---

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/08 21:55 upstream c2f2b01b74be d1b870e1 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro #1 (clean fs)] [mounted in repro #2] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry
2025/12/08 20:37 upstream c2f2b01b74be d1b870e1 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry
2025/12/08 19:27 upstream c2f2b01b74be d1b870e1 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry
2025/12/08 16:28 upstream c2f2b01b74be d1b870e1 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry
2025/12/09 20:48 upstream cb015814f8b6 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry
2025/12/08 15:20 upstream c2f2b01b74be d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in ocfs2_xa_remove_entry
* Struck through repros no longer work on HEAD.