UBUNTU: SAUCE: apparmor: fix not handling error case when securityfs_pin_fs() fails

BugLink: http://bugs.launchpad.net/bugs/1660842Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

security/apparmor/apparmorfs.c

@@ -1049,8 +1049,10 @@ static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
 	 * for pin_fs
 	 */
 	inode_unlock(dir);
-	securityfs_pin_fs();
+	error = securityfs_pin_fs();
 	inode_lock_nested(dir, I_MUTEX_PARENT);
+	if (error)
+		return error;
 
 	error = __securityfs_setup_d_inode(dir, dentry, mode | S_IFDIR,  NULL,
 					   NULL, NULL);