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

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Message-ID: <0000000000009001e405dc76cfba@google.com>
Date:   Tue, 12 Apr 2022 08:35:30 -0700
From:   syzbot <syzbot+331b35dba416a8c626ba@...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 (2)

Hello,

syzbot found the following issue on:

HEAD commit:    ff511c1c68a5 Add linux-next specific files for 20220408
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17921824f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d0168787d544f48e
dashboard link: https://syzkaller.appspot.com/bug?extid=331b35dba416a8c626ba
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.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+331b35dba416a8c626ba@...kaller.appspotmail.com

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 'long unsigned int'
CPU: 1 PID: 29651 Comm: syz-executor.0 Not tainted 5.18.0-rc1-next-20220408-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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_shift_out_of_bounds.cold+0xb1/0x187 lib/ubsan.c:322
 gfs2_read_sb fs/gfs2/ops_fstype.c:297 [inline]
 init_sb.cold+0x19/0x109 fs/gfs2/ops_fstype.c:488
 gfs2_fill_super+0x18a7/0x28a0 fs/gfs2/ops_fstype.c:1211
 get_tree_bdev+0x440/0x760 fs/super.c:1292
 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1327
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1320/0x1fa0 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 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+0x44/0xae
RIP: 0033:0x7f445ce8a57a
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:00007f445dfacf88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f445ce8a57a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f445dfacfe0
RBP: 00007f445dfad020 R08: 00007f445dfad020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f445dfacfe0 R15: 0000000020047a20
 </TASK>
================================================================================


---
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