CVE-2022-50864

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nilfs2: fix shift-out-of-bounds due to too large exponent of block size<br /> <br /> If field s_log_block_size of superblock data is corrupted and too large,<br /> init_nilfs() and load_nilfs() still can trigger a shift-out-of-bounds<br /> warning followed by a kernel panic (if panic_on_warn is set):<br /> <br /> shift exponent 38973 is too large for 32-bit type &amp;#39;int&amp;#39;<br /> Call Trace:<br /> <br /> dump_stack_lvl+0xcd/0x134<br /> ubsan_epilogue+0xb/0x50<br /> __ubsan_handle_shift_out_of_bounds.cold.12+0x17b/0x1f5<br /> init_nilfs.cold.11+0x18/0x1d [nilfs2]<br /> nilfs_mount+0x9b5/0x12b0 [nilfs2]<br /> ...<br /> <br /> This fixes the issue by adding and using a new helper function for getting<br /> block size with sanity check.