[syzbot] UBSAN: array-index-out-of-bounds in txCommit

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 493ffd6605b2 Merge tag 'ucount-rlimits-cleanups-for-v5.19'..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15d11444880000
kernel config: https://syzkaller.appspot.com/x/.config?x=d19f5d16783f901
dashboard link: https://syzkaller.appspot.com/bug?extid=0558d19c373e44da3c18
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f1ff6481e26f/disk-493ffd66.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/101bd3c7ae47/vmlinux-493ffd66.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0558d1...@syzkaller.appspotmail.com

================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_txnmgr.c:1738:5
index 18 is out of range for type 'xad_t [18]'
CPU: 1 PID: 11903 Comm: syz-executor.3 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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
xtLog fs/jfs/jfs_txnmgr.c:1738 [inline]
txLog fs/jfs/jfs_txnmgr.c:1391 [inline]
txCommit+0x3fb5/0x6d40 fs/jfs/jfs_txnmgr.c:1259
jfs_commit_inode+0x342/0x5a0 fs/jfs/inode.c:108
extAlloc+0xc93/0xff0 fs/jfs/jfs_extent.c:172
jfs_get_block+0x342/0xce0 fs/jfs/inode.c:248
get_more_blocks fs/direct-io.c:665 [inline]
do_direct_IO fs/direct-io.c:953 [inline]
__blockdev_direct_IO+0x17e7/0x3c90 fs/direct-io.c:1266
blockdev_direct_IO include/linux/fs.h:3204 [inline]
jfs_direct_IO+0xf6/0x1e0 fs/jfs/inode.c:336
generic_file_direct_write+0x294/0x610 mm/filemap.c:3669
__generic_file_write_iter+0x1c4/0x400 mm/filemap.c:3829
generic_file_write_iter+0xab/0x310 mm/filemap.c:3905
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
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: 0033:0x7fb2a168b5a9
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:00007fb2a05bc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fb2a17ac120 RCX: 00007fb2a168b5a9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000003
RBP: 00007fb2a16e6580 R08: 0000000000000000 R09: 0000000000000000
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd4c0de95f R14: 00007fb2a05bc300 R15: 0000000000022000
</TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 644e9524388a Merge tag 'for-v6.1-rc' of git://git.kernel.o..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16788381880000
kernel config: https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd

dashboard link: https://syzkaller.appspot.com/bug?extid=0558d19c373e44da3c18
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13591573880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c2c7ab880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0968428e17b4/disk-644e9524.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fd4c3bfd0777/vmlinux-644e9524.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ee4571f27f1c/bzImage-644e9524.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/0fdce98f569c/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0558d1...@syzkaller.appspotmail.com

================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_txnmgr.c:1738:5
index 18 is out of range for type 'xad_t [18]'

CPU: 1 PID: 3636 Comm: syz-executor352 Not tainted 6.1.0-rc6-syzkaller-00308-g644e9524388a #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
xtLog fs/jfs/jfs_txnmgr.c:1738 [inline]
txLog fs/jfs/jfs_txnmgr.c:1391 [inline]
txCommit+0x3fb5/0x6d40 fs/jfs/jfs_txnmgr.c:1259
jfs_commit_inode+0x342/0x5a0 fs/jfs/inode.c:108
extAlloc+0xc93/0xff0 fs/jfs/jfs_extent.c:172
jfs_get_block+0x342/0xce0 fs/jfs/inode.c:248

__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:304
generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3753
__generic_file_write_iter+0x176/0x400 mm/filemap.c:3881
generic_file_write_iter+0xab/0x310 mm/filemap.c:3913

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
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: 0033:0x7f12751c65e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 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:00007f12751512f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f12752517f0 RCX: 00007f12751c65e9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007f127521e0e4 R08: 0000000000000000 R09: 0000000000000000
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 65732f636f72702f
R13: 0030656c69662f2e R14: 0031656c69662f2e R15: 00007f12752517f8
</TASK>
================================================================================

[syzbot]

syzbot suspects this issue was fixed by commit:

commit a779ed754e52d582b8c0e17959df063108bd0656
Author: Dave Kleikamp <dave.k...@oracle.com>
Date: Thu Oct 5 14:16:14 2023 +0000

jfs: define xtree root and page independently

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14f67ce2e80000
start commit: d88520ad73b7 Merge tag 'pull-nfsd-fix' of git://git.kernel..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=9ee601744db6e780
dashboard link: https://syzkaller.appspot.com/bug?extid=0558d19c373e44da3c18
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11e974ed680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11b2588b680000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: jfs: define xtree root and page independently

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in txCommit
Author: dave.k...@oracle.com

#syz fix: jfs: define xtree root and page independently