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Commit dc82eaab authored by Sheng Yong's avatar Sheng Yong Committed by Jaegeuk Kim
Browse files

f2fs: check if file namelen exceeds max value 



Dentry bitmap is not enough to detect incorrect dentries. So this patch
also checks the namelen value of a dentry.

Signed-off-by: default avatarGong Chen <gongchen4@huawei.com>
Signed-off-by: default avatarSheng Yong <shengyong1@huawei.com>
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 19abd88b

fs/f2fs/dir.c

+2 −1
Original line number Diff line number Diff line
@@ -814,7 +814,8 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, 


		/* check memory boundary before moving forward */

		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));

		if (unlikely(bit_pos > d->max)) {

		if (unlikely(bit_pos > d->max ||

				le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {

			f2fs_msg(sbi->sb, KERN_WARNING,

				"%s: corrupted namelen=%d, run fsck to fix.",

				__func__, le16_to_cpu(de->name_len));