From 3df629d873f8683af6f0d34dfc743f637966d483 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 13 Oct 2018 00:19:13 -0400
Subject: [PATCH] gfs2_meta: ->mount() can get NULL dev_name
Git-commit: 3df629d873f8683af6f0d34dfc743f637966d483
Patch-mainline: v4.20-rc1
References: bsc#1118768
get in sync with mount_bdev() handling of the same
Reported-by: syzbot+c54f8e94e6bba03b04e9@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Jan Kara <jack@suse.cz>
---
fs/gfs2/ops_fstype.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index c2469833b4fb..6b84ef6ccff3 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1333,6 +1333,9 @@ static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
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",
--
2.16.4