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UBSAN: shift-out-of-bounds in fs/erofs/super.c:161:3
shift exponent 253 is too large for 32-bit type 'int'
CPU: 0 PID: 4506 Comm: syz-executor.4 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
 erofs_read_superblock fs/erofs/super.c:161 [inline]
 erofs_fc_fill_super.cold+0x6c/0x35c fs/erofs/super.c:357
 get_tree_bdev+0x440/0x760 fs/super.c:1291
 vfs_get_tree+0x89/0x2f0 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x13ad/0x20c0 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3409
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4672ba
Code: 48 c7 c2 bc 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f337da0dfa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004672ba
RDX: 0000000020000040 RSI: 0000000020000100 RDI: 00007f337da0e000
RBP: 00007f337da0e040 R08: 00007f337da0e040 R09: 0000000020000040
R10: 0000000001800000 R11: 0000000000000206 R12: 0000000020000040
R13: 0000000020000100 R14: 00007f337da0e000 R15: 0000000020000000
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