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gfs2_meta: ->mount() can get NULL dev_name

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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>
This commit is contained in:
Al Viro 2018-10-13 00:19:13 -04:00
parent 74dd7c97ea
commit 3df629d873
1 changed files with 3 additions and 0 deletions
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3
fs/gfs2/ops_fstype.c
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@ -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",