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

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 59dbb9d81adf Merge tag 'xsa465+xsa466-6.13-tag' of git://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15a64b44580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6a2b862bf4a5409f
dashboard link: https://syzkaller.appspot.com/bug?extid=9120834fc227768625ba
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-59dbb9d8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e0cc89779297/vmlinux-59dbb9d8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5e6c895062cb/bzImage-59dbb9d8.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+912083...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
syz.0.0: attempt to access beyond end of device
loop0: rw=1, sector=4680032, nr_sectors = 8 limit=32768
metapage_write_end_io: I/O error
ERROR: (device loop0): release_metapage: metapage_write_one() failed
ERROR: (device loop0): remounting filesystem as read-only
blkno = 8ed2c, nblocks = 1
ERROR: (device loop0): dbUpdatePMap: blocks are outside the map
blkno = 8ed2c, nblocks = 1
ERROR: (device loop0): dbUpdatePMap: blocks are outside the map
UFO tlock:0xffffc90001537090
------------[ 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: 5314 Comm: syz.0.0 Not tainted 6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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_getdents fs/readdir.c:322 [inline]
__se_sys_getdents+0x1fd/0x4e0 fs/readdir.c:308
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: 0033:0x7f6e27385d29
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6e28204038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f6e27575fa0 RCX: 00007f6e27385d29
RDX: 00000000000000b8 RSI: 0000000020001fc0 RDI: 0000000000000005
RBP: 00007f6e27401a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6e27575fa0 R15: 00007ffdef535ad8
</TASK>
---[ end trace ]---


---
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[syzbot]

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+912083...@syzkaller.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 ]---


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