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

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: b229b6ca5abb Merge tag 'perf-tools-fixes-for-v6.1-2022-10-..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=156d7cee880000
kernel config: https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
dashboard link: https://syzkaller.appspot.com/bug?extid=aea1ad91e854d0a83e04
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, 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/ba5b49fa77de/disk-b229b6ca.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7c061f2ae4dc/vmlinux-b229b6ca.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bc45c1300e9b/bzImage-b229b6ca.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aea1ad...@syzkaller.appspotmail.com

loop5: detected capacity change from 0 to 96859
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2926:29
index 1365 is out of range for type 's8 [1365]'
CPU: 1 PID: 14172 Comm: syz-executor.5 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
ubsan_epilogue+0xb/0x50 lib/ubsan.c:151
__ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:283
dbFindLeaf+0x21d/0x260 fs/jfs/jfs_dmap.c:2926
dbAllocDmapLev+0xa3/0x2c0 fs/jfs/jfs_dmap.c:1937
dbAllocCtl+0x131/0x780 fs/jfs/jfs_dmap.c:1793
dbAllocAG+0x8da/0xd20 fs/jfs/jfs_dmap.c:1334
dbAlloc+0x40d/0xa70 fs/jfs/jfs_dmap.c:858
dtSplitUp+0x365/0x5130 fs/jfs/jfs_dtree.c:974
dtInsert+0x82b/0xa10 fs/jfs/jfs_dtree.c:863
jfs_rename+0x1059/0x1a20 fs/jfs/namei.c:1219
vfs_rename+0x115e/0x1a90 fs/namei.c:4778
do_renameat2+0xb5e/0xc80 fs/namei.c:4929
__do_sys_rename fs/namei.c:4975 [inline]
__se_sys_rename fs/namei.c:4973 [inline]
__x64_sys_rename+0x7d/0xa0 fs/namei.c:4973
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f734da8b5a9
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:00007f734e81d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f734dbabf80 RCX: 00007f734da8b5a9
RDX: 0000000000000000 RSI: 0000000020005240 RDI: 00000000200001c0
RBP: 00007f734dae67b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdd3afd17f R14: 00007f734e81d300 R15: 0000000000022000
</TASK>
================================================================================


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: e4cf7c25bae5 Merge tag 'kbuild-fixes-v6.2' of git://git.ke..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=141a6274480000
kernel config: https://syzkaller.appspot.com/x/.config?x=68e0be42c8ee4bb4
dashboard link: https://syzkaller.appspot.com/bug?extid=aea1ad91e854d0a83e04
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=10faef4c480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13170968480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0a2dc7ed8cf1/disk-e4cf7c25.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b35476d531fc/vmlinux-e4cf7c25.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a66192aa25a5/bzImage-e4cf7c25.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/78eabe0740c8/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aea1ad...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2941:16
index 1381 is out of range for type 's8 [1365]'
CPU: 0 PID: 5067 Comm: syz-executor239 Not tainted 6.2.0-rc1-syzkaller-00095-ge4cf7c25bae5 #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+0x1b1/0x290 lib/dump_stack.c:106
ubsan_epilogue lib/ubsan.c:151 [inline]
__ubsan_handle_out_of_bounds+0xe0/0x110 lib/ubsan.c:282
dbFindLeaf+0x30a/0x440 fs/jfs/jfs_dmap.c:2941
dbAllocDmapLev+0xa9/0x420 fs/jfs/jfs_dmap.c:1952
dbAllocCtl+0x113/0x970 fs/jfs/jfs_dmap.c:1808
dbAllocAG+0x28b/0x1100 fs/jfs/jfs_dmap.c:1349
dbAlloc+0x661/0xc90 fs/jfs/jfs_dmap.c:873
dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]
dtInsert+0xc0e/0x6b80 fs/jfs/jfs_dtree.c:863
jfs_mkdir+0x757/0xb00 fs/jfs/namei.c:270
vfs_mkdir+0x3b3/0x590 fs/namei.c:4036
do_mkdirat+0x25b/0x530 fs/namei.c:4061
__do_sys_mkdirat fs/namei.c:4076 [inline]
__se_sys_mkdirat fs/namei.c:4074 [inline]
__x64_sys_mkdirat+0x85/0x90 fs/namei.c:4074
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: 0033:0x7f2ba532cb29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd3c83968 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2ba532cb29
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007f2ba52ec130 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2ba52ec1c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
================================================================================