linux-kernel - [syzbot] [f2fs?] UBSAN: shift-out-of-bounds in f2fs_fill

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Message-ID: <000000000000a86a7c05f32b7f91@google.com>
Date:   Thu, 26 Jan 2023 06:23:54 -0800
From:   syzbot <syzbot+fea4bcda5eb938ee88ed@...kaller.appspotmail.com>
To:     chao@...nel.org, jaegeuk@...nel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        terrelln@...com
Subject: [syzbot] [f2fs?] UBSAN: shift-out-of-bounds in f2fs_fill_super (2)

Hello,

syzbot found the following issue on:

HEAD commit:    2241ab53cbb5 Linux 6.2-rc5
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11e678a9480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c5d89b670f0458d
dashboard link: https://syzkaller.appspot.com/bug?extid=fea4bcda5eb938ee88ed
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.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e370de928a15/disk-2241ab53.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a32aa1a12bc4/vmlinux-2241ab53.xz
kernel image: https://storage.googleapis.com/syzbot-assets/914736862f98/bzImage-2241ab53.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fea4bcda5eb938ee88ed@...kaller.appspotmail.com

F2FS-fs (loop0): Fix alignment : internally, start(4096) end(16896) block(12288)
F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0xe8b)
F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock
================================================================================
UBSAN: shift-out-of-bounds in fs/f2fs/super.c:4184:41
shift exponent 613 is too large for 64-bit type 'loff_t' (aka 'long long')
CPU: 1 PID: 5467 Comm: syz-executor.0 Not tainted 6.2.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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_shift_out_of_bounds+0x33d/0x3a0 lib/ubsan.c:321
 f2fs_fill_super+0x5518/0x6ee0 fs/f2fs/super.c:4184
 mount_bdev+0x26c/0x3a0 fs/super.c:1359
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1489
 do_new_mount+0x289/0xad0 fs/namespace.c:3145
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674
 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: 0033:0x7f7ad2e8d5fa
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:00007f7ad3bccf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000000054f7 RCX: 00007f7ad2e8d5fa
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007f7ad3bccfe0
RBP: 00007f7ad3bcd020 R08: 00007f7ad3bcd020 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000202 R12: 0000000020000040
R13: 0000000020000080 R14: 00007f7ad3bccfe0 R15: 00000000200056c0
 </TASK>
================================================================================


---
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