[syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dbAdjTree (2)

[syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dbAdjTree (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    ea5f6ad9ad96 Merge tag 'platform-drivers-x86-v6.10-1' of g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e91bd4980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3e06a6259c6a4416
dashboard link: https://syzkaller.appspot.com/bug?extid=412dea214d8baa3f7483
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/db5d9201b572/disk-ea5f6ad9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8d8ed484f1b5/vmlinux-ea5f6ad9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0de047f553aa/bzImage-ea5f6ad9.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+412dea214d8baa3f7483@syzkaller.appspotmail.com

UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2900:31
index -3 is out of range for type 's8 [1365]'
CPU: 0 PID: 111 Comm: jfsCommit Not tainted 6.9.0-syzkaller-08284-gea5f6ad9ad96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:114
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x110/0x150 lib/ubsan.c:429
 dbAdjTree+0x383/0x3d0 fs/jfs/jfs_dmap.c:2900
 dbJoin+0x24b/0x2b0 fs/jfs/jfs_dmap.c:2841
 dbFreeBits+0x15c/0x8f0 fs/jfs/jfs_dmap.c:2338
 dbFreeDmap+0x62/0x1b0 fs/jfs/jfs_dmap.c:2087
 dbFree+0x266/0x550 fs/jfs/jfs_dmap.c:409
 txFreeMap+0x788/0xe60 fs/jfs/jfs_txnmgr.c:2515
 xtTruncate+0x1e57/0x2c80 fs/jfs/jfs_xtree.c:2467
 jfs_free_zero_link+0x372/0x4f0 fs/jfs/namei.c:759
 jfs_evict_inode+0x423/0x4b0 fs/jfs/inode.c:153
 evict+0x2f0/0x6c0 fs/inode.c:667
 iput_final fs/inode.c:1741 [inline]
 iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
 iput+0x5c/0x80 fs/inode.c:1757
 txUpdateMap+0xaf3/0xd20 fs/jfs/jfs_txnmgr.c:2367
 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]
 jfs_lazycommit+0x5e6/0xb20 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
---[ end trace ]---


---
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If the report is already addressed, let syzbot know by replying with:
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If the report is a duplicate of another one, reply with:
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#syz undup

Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dbAdjTree (2)

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    d7a5aa4b3c00 Merge tag 'perf-tools-fixes-for-v6.11-2024-08..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=109f2df3980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=92c0312151c4e32e
dashboard link: https://syzkaller.appspot.com/bug?extid=412dea214d8baa3f7483
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12114991980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11422f5d980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/64022429061b/disk-d7a5aa4b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f4aba88f7db8/vmlinux-d7a5aa4b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/120456a2d9dc/bzImage-d7a5aa4b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/947fb73311a3/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+412dea214d8baa3f7483@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2902:18
index -3 is out of range for type 's8[1365]' (aka 'signed char[1365]')
CPU: 0 UID: 0 PID: 5217 Comm: syz-executor310 Not tainted 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
 dbAdjTree+0x377/0x520 fs/jfs/jfs_dmap.c:2902
 dbAllocBits+0x4ea/0x990 fs/jfs/jfs_dmap.c:2193
 dbAllocDmap+0x6d/0x150 fs/jfs/jfs_dmap.c:2034
 dbAlloc+0x509/0xca0 fs/jfs/jfs_dmap.c:816
 extBalloc fs/jfs/jfs_extent.c:326 [inline]
 extAlloc+0x4f8/0x1010 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x41b/0xe60 fs/jfs/inode.c:248
 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2125
 __block_write_begin fs/buffer.c:2174 [inline]
 block_write_begin+0x9b/0x1e0 fs/buffer.c:2235
 jfs_write_begin+0x31/0x70 fs/jfs/inode.c:299
 generic_perform_write+0x399/0x840 mm/filemap.c:4019
 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4147
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8ed0fe9e99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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:00007ffed45f7398 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8ed1033095 RCX: 00007f8ed0fe9e99
RDX: 00000000fffffdef RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00007f8ed10645f0 R08: 00005555618f94c0 R09: 00005555618f94c0
R10: 0000000000006289 R11: 0000000000000246 R12: 00007ffed45f73c0
R13: 00007ffed45f75e8 R14: 431bde82d7b634db R15: 00007f8ed103303b
 </TASK>
---[ end trace ]---


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

Re: [syzbot] UBSAN: array-index-out-of-bounds in dbAdjTree (2)

[syzbot]

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

***

Subject: UBSAN: array-index-out-of-bounds in dbAdjTree (2)
Author: niharchaithanya@gmail.com

#syz test

Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dbAdjTree (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+412dea214d8baa3f7483@syzkaller.appspotmail.com
Tested-by: syzbot+412dea214d8baa3f7483@syzkaller.appspotmail.com

Tested on:

commit:         87d6aab2 Merge tag 'for_linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1459a327980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fb28c205c377e04a
dashboard link: https://syzkaller.appspot.com/bug?extid=412dea214d8baa3f7483
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11d08f9f980000

Note: testing is done by a robot and is best-effort only.