linux-kernel - [PATCH 3.16 078/305] gfs2_meta: ->mount() can get NULL dev

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Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Al Viro" <viro@...iv.linux.org.uk>,
        syzbot+c54f8e94e6bba03b04e9@...kaller.appspotmail.com
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@...iv.linux.org.uk>

commit 3df629d873f8683af6f0d34dfc743f637966d483 upstream.

get in sync with mount_bdev() handling of the same

Reported-by: syzbot+c54f8e94e6bba03b04e9@...kaller.appspotmail.com
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@...adent.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",