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Message-ID: <6771e8ee.050a0220.2f3838.04af.GAE@google.com>
Date: Sun, 29 Dec 2024 16:27:26 -0800
From: syzbot <syzbot+9120834fc227768625ba@...kaller.appspotmail.com>
To: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtReadFirst (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    4099a71718b0 Merge tag 'sched-urgent-2024-12-29' of git://..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1313a818580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4c4096b0d467a682
dashboard link: https://syzkaller.appspot.com/bug?extid=9120834fc227768625ba
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=15382ac4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=146a70b0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c085f394f11d/disk-4099a717.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5aac16cee3e0/vmlinux-4099a717.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f9412e3c8aa0/bzImage-4099a717.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3ac4b5cf3ab6/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9120834fc227768625ba@...kaller.appspotmail.com

------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3096:10
index 237 is out of range for type 'struct dtslot[128]'
CPU: 0 UID: 0 PID: 5822 Comm: syz-executor740 Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
 dtReadFirst+0x622/0xc50 fs/jfs/jfs_dtree.c:3096
 dtReadNext fs/jfs/jfs_dtree.c:3147 [inline]
 jfs_readdir+0x9aa/0x3c50 fs/jfs/jfs_dtree.c:2862
 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65
 iterate_dir+0x571/0x800 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x1e2/0x4b0 fs/readdir.c:389
 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: 0033:0x7f1a02212fa3
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 a2 48 fb ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8
RSP: 002b:00007fffd5e0be18 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055557b4c7730 RCX: 00007f1a02212fa3
RDX: 0000000000008000 RSI: 000055557b4c7730 RDI: 0000000000000004
RBP: 000055557b4c7704 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb8
R13: 0000000000000010 R14: 000055557b4c7700 R15: 00007fffd5e0e090
 </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.

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