Bluetooth: Fix memory leak with L2CAP channels

A new l2cap_chan_free() is added to free the channels.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/l2cap.h

@@ -469,6 +469,7 @@ struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
 void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err);
 struct l2cap_chan *l2cap_chan_alloc(struct sock *sk);
 void l2cap_chan_del(struct l2cap_chan *chan, int err);
+void l2cap_chan_free(struct l2cap_chan *chan);
 int l2cap_chan_connect(struct l2cap_chan *chan);
 
 #endif /* __L2CAP_H */

net/bluetooth/l2cap_core.c

@@ -160,6 +160,11 @@ struct l2cap_chan *l2cap_chan_alloc(struct sock *sk)
 	return chan;
 }
 
+void l2cap_chan_free(struct l2cap_chan *chan)
+{
+	kfree(chan);
+}
+
 static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
 {
 	struct sock *sk = chan->sk;
@@ -236,7 +241,7 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err)
 
 	if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE &&
 			chan->conf_state & L2CAP_CONF_INPUT_DONE))
-		goto free;
+		return;
 
 	skb_queue_purge(&chan->tx_q);
 
@@ -255,9 +260,6 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err)
 			kfree(l);
 		}
 	}
-
-free:
-	kfree(chan);
 }
 
 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)

net/bluetooth/l2cap_sock.c

@@ -849,6 +849,8 @@ void l2cap_sock_kill(struct sock *sk)
 	BT_DBG("sk %p state %d", sk, sk->sk_state);
 
 	/* Kill poor orphan */
+
+	l2cap_chan_free(l2cap_pi(sk)->chan);
 	bt_sock_unlink(&l2cap_sk_list, sk);
 	sock_set_flag(sk, SOCK_DEAD);
 	sock_put(sk);