linux-kernel - [syzbot] UBSAN: shift-out-of-bounds in init

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Message-ID: <000000000000c371f705e6259a38@google.com>
Date:   Sat, 13 Aug 2022 13:54:28 -0700
From:   syzbot <syzbot+dcf33a7aae997956fe06@...kaller.appspotmail.com>
To:     agruenba@...hat.com, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org, rpeterso@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] UBSAN: shift-out-of-bounds in init_sb (3)

Hello,

syzbot found the following issue on:

HEAD commit:    200e340f2196 Merge tag 'pull-work.dcache' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=150cbda9080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1b664fba5e66c4bf
dashboard link: https://syzkaller.appspot.com/bug?extid=dcf33a7aae997956fe06
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dcf33a7aae997956fe06@...kaller.appspotmail.com

loop1: detected capacity change from 0 to 37440
gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
gfs2: fsid=syz:syz: Now mounting FS (format 1801)...
================================================================================
UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:297:19
shift exponent 50331651 is too large for 64-bit type 'unsigned long'
CPU: 0 PID: 30381 Comm: syz-executor.1 Not tainted 5.19.0-syzkaller-02972-g200e340f2196 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3a6/0x420 lib/ubsan.c:322
 gfs2_read_sb fs/gfs2/ops_fstype.c:297 [inline]
 init_sb+0x11d6/0x12c0 fs/gfs2/ops_fstype.c:487
 gfs2_fill_super+0x1a3c/0x2750 fs/gfs2/ops_fstype.c:1209
 get_tree_bdev+0x400/0x620 fs/super.c:1292
 gfs2_get_tree+0x50/0x210 fs/gfs2/ops_fstype.c:1325
 vfs_get_tree+0x88/0x270 fs/super.c:1497
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc20ac8a7aa
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007fc20be95f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fc20ac8a7aa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fc20be95fe0
RBP: 00007fc20be96020 R08: 00007fc20be96020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007fc20be95fe0 R15: 0000000020047a20
 </TASK>
================================================================================


---
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