syzbot

loop0: detected capacity change from 0 to 128
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/befs/super.c:96:9
shift exponent 3229888891 is too large for 32-bit type 'int'
CPU: 1 PID: 5062 Comm: syz-executor485 Not tainted 6.8.0-rc6-syzkaller-00250-g04b8076df253 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2a6/0x480 lib/ubsan.c:386
 befs_check_sb.cold+0x19/0x6f fs/befs/super.c:96
 befs_fill_super+0x9ea/0x1140 fs/befs/linuxvfs.c:871
 mount_bdev+0x1e3/0x2d0 fs/super.c:1658
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14ea/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fde7091ddaa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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:00007fff16284938 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff16284940 RCX: 00007fde7091ddaa
RDX: 0000000020000100 RSI: 0000000020009e40 RDI: 00007fff16284940
RBP: 0000000000000004 R08: 00007fff16284980 R09: 0000000000009e1f
R10: 0000000003008001 R11: 0000000000000282 R12: 00007fff16284980
R13: 0000000000000003 R14: 0000000000010000 R15: 00007fde7096503b
 </TASK>
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