[PATCH] ntfs: Validate error in ntfs_lookup()

[Hongling Zeng]

Check that MREF_ERR returns non-zero before using as error pointer.
This prevents potential ERR_PTR(0) when error code is zero

Fixes: af0db57d4293 ("ntfs: update inode operations")
Signed-off-by: Hongling Zeng <zenghongling@xxxxxxxxxx>
---
 fs/ntfs/namei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs/namei.c b/fs/ntfs/namei.c
index 10894de519c3..bb075aa97b53 100644
--- a/fs/ntfs/namei.c
+++ b/fs/ntfs/namei.c
@@ -236,7 +236,7 @@ static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
 	}
 	ntfs_error(vol->sb, "ntfs_lookup_ino_by_name() failed with error code %i.",
 			-MREF_ERR(mref));
-	return ERR_PTR(MREF_ERR(mref));
+	return MREF_ERR(mref) ? ERR_PTR(MREF_ERR(mref)) : NULL;
 handle_name:
 	{
 		struct mft_record *m;
-- 
2.25.1