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Subject[PATCH 3.16 078/305] gfs2_meta: ->mount() can get NULL dev_name
3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <viro@zeniv.linux.org.uk>

commit 3df629d873f8683af6f0d34dfc743f637966d483 upstream.

get in sync with mount_bdev() handling of the same

Reported-by: syzbot+c54f8e94e6bba03b04e9@syzkaller.appspotmail.com
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/gfs2/ops_fstype.c | 3 +++
1 file changed, 3 insertions(+)

--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1365,6 +1365,9 @@ 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",
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