Bluetooth: Check if we really are in WAIT_F when F bit comes

F-bit set should be processed only if we are in the WAIT_F state.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap.c

@@ -3503,7 +3503,8 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
 
 	BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
 
-	if (L2CAP_CTRL_FINAL & rx_control) {
+	if (L2CAP_CTRL_FINAL & rx_control &&
+			l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
 		del_timer(&pi->monitor_timer);
 		if (pi->unacked_frames > 0)
 			__mod_retrans_timer();
@@ -3727,7 +3728,8 @@ static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, str
 {
 	BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
 
-	if (L2CAP_CTRL_FINAL & rx_control) {
+	if (L2CAP_CTRL_FINAL & rx_control &&
+			l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
 		del_timer(&l2cap_pi(sk)->monitor_timer);
 		if (l2cap_pi(sk)->unacked_frames > 0)
 			__mod_retrans_timer();