linux-kernel - [syzbot] UBSAN: array-index-out-of-bounds in diAlloc

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Date:   Tue, 27 Sep 2022 04:45:56 -0700
From:   syzbot <syzbot+79d792676d8ac050949f@...kaller.appspotmail.com>
To:     jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] UBSAN: array-index-out-of-bounds in diAlloc

Hello,

syzbot found the following issue on:

HEAD commit:    f76349cf4145 Linux 6.0-rc7
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11b538a8880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=79d792676d8ac050949f
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=15fcb718880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10b6f84c880000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+79d792676d8ac050949f@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 65535
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:1359:19
index -1 is out of range for type 'atomic_t [128]'
CPU: 1 PID: 3614 Comm: syz-executor361 Not tainted 6.0.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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
 diAlloc+0x1434/0x1700 fs/jfs/jfs_imap.c:1359
 ialloc+0x8c/0xa80 fs/jfs/jfs_inode.c:56
 jfs_create+0x13a/0xb10 fs/jfs/namei.c:92
 lookup_open fs/namei.c:3413 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x12d0/0x2df0 fs/namei.c:3688
 do_filp_open+0x264/0x4f0 fs/namei.c:3718
 do_sys_openat2+0x124/0x4e0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_open fs/open.c:1337 [inline]
 __se_sys_open fs/open.c:1333 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1333
 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: 0033:0x7fc66ba13fc9
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffda59a6f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc66ba13fc9
RDX: 0000000000000000 RSI: 00000000000000f0 RDI: 0000000020000140
RBP: 00007fc66b9d3790 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffda59a6de0 R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00083878000000f8 R15: 0000000000000000
 </TASK>
================================================================================


---
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