From c6f89dfd528041de2e71788495579a18c0363869 Mon Sep 17 00:00:00 2001 From: Kinglong Mee Date: Wed, 15 Mar 2017 21:12:50 +0800 Subject: [PATCH] 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 Signed-off-by: Jaegeuk Kim --- fs/f2fs/checkpoint.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 22348c7df67d..7dd7dd5914c5 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -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; -- 2.39.5