From 3df629d873f8683af6f0d34dfc743f637966d483 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 13 Oct 2018 00:19:13 -0400 Subject: gfs2_meta: ->mount() can get NULL dev_name 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 --- fs/gfs2/ops_fstype.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/gfs2/ops_fstype.c') 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", -- cgit v1.2.3-59-g8ed1b