syzbot


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

Status: upstream: reported on 2022/11/06 20:21
Reported-by: syzbot+e526b0844b096abaa8c7@syzkaller.appspotmail.com
First crash: 26d, last: 14d

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: 15941 Comm: syz-executor.5 Not tainted 6.1.0-rc5-syzkaller #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
 do_mpage_readpage+0x970/0x1c50 fs/mpage.c:208
 mpage_readahead+0x210/0x380 fs/mpage.c:361
 read_pages+0x169/0x9c0 mm/readahead.c:161
 page_cache_ra_unbounded+0x703/0x820 mm/readahead.c:270
 filemap_readahead mm/filemap.c:2557 [inline]
 filemap_get_pages+0x72f/0x10d0 mm/filemap.c:2597
 filemap_read+0x3cf/0xea0 mm/filemap.c:2675
 call_read_iter include/linux/fs.h:2185 [inline]
 generic_file_splice_read+0x1ff/0x5d0 fs/splice.c:309
 do_splice_to fs/splice.c:793 [inline]
 splice_direct_to_actor+0x41b/0xc00 fs/splice.c:865
 do_splice_direct+0x279/0x3d0 fs/splice.c:974
 do_sendfile+0x5fb/0xf80 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309
 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: 0033:0x7f519d88b639
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f519e575168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f519d9ac050 RCX: 00007f519d88b639
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007f519d8e6ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000001000fc4 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffd1b4809f R14: 00007f519e575300 R15: 0000000000022000
 </TASK>
================================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-fs 2022/11/14 15:18 upstream 094226ad94f4 943f4cb8 .config log report info UBSAN: array-index-out-of-bounds in xtLookup
ci2-upstream-fs 2022/11/02 20:18 upstream b229b6ca5abb 08977f5d .config log report info UBSAN: array-index-out-of-bounds in xtLookup
* Struck through repros no longer work on HEAD.