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f2fs: sanity check of crc_offset from raw checkpoint 

The crc_offset towards or beyond the end of block is wrong,
sanity check it.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Kinglong Mee 2017-03-15 21:12:50 +08:00 committed by Jaegeuk Kim
parent d03ba4cc3f
commit c6f89dfd52
1 changed files with 1 additions and 1 deletions
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2
fs/f2fs/checkpoint.c
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@ -678,7 +678,7 @@ static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
*cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
if (crc_offset >= blk_size) {
if (crc_offset > (blk_size - sizeof(__le32))) {
f2fs_msg(sbi->sb, KERN_WARNING,
"invalid crc_offset: %zu", crc_offset);
return -EINVAL;