syzbot


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

Status: auto-obsoleted due to no activity on 2023/04/14 02:21
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+e526b0844b096abaa8c7@syzkaller.appspotmail.com
First crash: 532d, last: 490d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] UBSAN: array-index-out-of-bounds in xtLookup 0 (1) 2022/11/06 20:21
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 UBSAN: array-index-out-of-bounds in xtLookup origin:upstream missing-backport C error 1 288d 288d 0/3 upstream: reported C repro on 2023/07/04 11:41

Sample crash report:
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:179:9
index 19 is out of range for type 'xad_t [18]'
CPU: 0 PID: 16385 Comm: syz-executor.1 Not tainted 6.1.0-syzkaller-09941-ge2ca6ba6ba01 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0xdb/0x130 lib/ubsan.c:283
 xtLookup+0x86c/0x880 fs/jfs/jfs_xtree.c:179
 jfs_get_block+0x24b/0xce0 fs/jfs/inode.c:218
 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x93/0x1e0 fs/buffer.c:2102
 jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:299
 generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3772
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3900
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3932
 do_iter_write+0x6c2/0xc20 fs/read_write.c:861
 iter_file_splice_write+0x7fc/0xfc0 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0xe6/0x1c0 fs/splice.c:931
 splice_direct_to_actor+0x4e4/0xc00 fs/splice.c:886
 do_splice_direct+0x279/0x3d0 fs/splice.c:974
 generic_copy_file_range fs/read_write.c:1393 [inline]
 vfs_copy_file_range+0xb9d/0x1670 fs/read_write.c:1539
 __do_sys_copy_file_range fs/read_write.c:1596 [inline]
 __se_sys_copy_file_range+0x3f9/0x5e0 fs/read_write.c:1559
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff4aa08c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff4a1159168 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007ff4aa1ac390 RCX: 00007ff4aa08c0d9
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007ff4aa0e7ae9 R08: 0040000000000004 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc450ea4cf R14: 00007ff4a1159300 R15: 0000000000022000
 </TASK>
================================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/15 02:21 upstream e2ca6ba6ba01 b18f0a64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: array-index-out-of-bounds in xtLookup
2022/11/14 15:18 upstream 094226ad94f4 943f4cb8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: array-index-out-of-bounds in xtLookup
2022/11/02 20:18 upstream b229b6ca5abb 08977f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: array-index-out-of-bounds in xtLookup
* Struck through repros no longer work on HEAD.