4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit 3df629d873f8683af6f0d34dfc743f637966d483 upstream.
get in sync with mount_bdev() handling of the same
Reported-by: syzbot+c54f8e94e6bba03b04e9@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/gfs2/ops_fstype.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1355,6 +1355,9 @@ static struct dentry *gfs2_mount_meta(st
struct path path;
int error;
+ if (!dev_name || !*dev_name)
+ return ERR_PTR(-EINVAL);
+
error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
if (error) {
pr_warn("path_lookup on %s returned error %d\n",
