From: Al Viro Date: Sat, 13 Oct 2018 04:19:13 +0000 (-0400) Subject: gfs2_meta: ->mount() can get NULL dev_name X-Git-Tag: v4.9.137~55 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4b347ab6ee3c018c3007cb87fc4a8b1e4dd285e0;p=platform%2Fkernel%2Flinux-amlogic.git gfs2_meta: ->mount() can get NULL dev_name commit 3df629d873f8683af6f0d34dfc743f637966d483 upstream. 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index ff72ac6..6d7f668 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -1355,6 +1355,9 @@ 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",