static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
			      int alen, int flags)
{
	struct sock *sk = sock->sk;
	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
	struct sockaddr_l2 la;
	int len, err = 0;
	bool zapped;

	BT_DBG("sk %p", sk);

	lock_sock(sk);
	zapped = sock_flag(sk, SOCK_ZAPPED);
	release_sock(sk);

	if (zapped)
		return -EINVAL;

	if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
	    addr->sa_family != AF_BLUETOOTH)
		return -EINVAL;

	memset(&la, 0, sizeof(la));
	len = min_t(unsigned int, sizeof(la), alen);
	memcpy(&la, addr, len);

	if (la.l2_cid && la.l2_psm)
		return -EINVAL;

	if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
		return -EINVAL;

	/* Check that the socket wasn't bound to something that
	 * conflicts with the address given to connect(). If chan->src
	 * is BDADDR_ANY it means bind() was never used, in which case
	 * chan->src_type and la.l2_bdaddr_type do not need to match.
	 */
	if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
	    bdaddr_type_is_le(la.l2_bdaddr_type)) {
		/* Old user space versions will try to incorrectly bind
		 * the ATT socket using BDADDR_BREDR. We need to accept
		 * this and fix up the source address type only when
		 * both the source CID and destination CID indicate
		 * ATT. Anything else is an invalid combination.
		 */
		if (chan->scid != L2CAP_CID_ATT ||
		    la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
			return -EINVAL;

		/* We don't have the hdev available here to make a
		 * better decision on random vs public, but since all
		 * user space versions that exhibit this issue anyway do
		 * not support random local addresses assuming public
		 * here is good enough.
		 */
		chan->src_type = BDADDR_LE_PUBLIC;
	}

	if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
		return -EINVAL;

	if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
		/* We only allow ATT user space socket */
		if (la.l2_cid &&
		    la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
			return -EINVAL;
	}

	if (chan->psm && bdaddr_type_is_le(chan->src_type) && !chan->mode)
		chan->mode = L2CAP_MODE_LE_FLOWCTL;

	err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
				 &la.l2_bdaddr, la.l2_bdaddr_type);
	if (err)
		return err;

	lock_sock(sk);

	err = bt_sock_wait_state(sk, BT_CONNECTED,
				 sock_sndtimeo(sk, flags & O_NONBLOCK));

	release_sock(sk);

	return err;
}
static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
			      int alen, int flags)
{
	struct sock *sk = sock->sk;
	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
	struct sockaddr_l2 la;
	int len, err = 0;
	bool zapped;

	BT_DBG("sk %p", sk);

	lock_sock(sk);
	zapped = sock_flag(sk, SOCK_ZAPPED);
	release_sock(sk);

	if (zapped)
		return -EINVAL;

	if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
	    addr->sa_family != AF_BLUETOOTH)
		return -EINVAL;

	memset(&la, 0, sizeof(la));
	len = min_t(unsigned int, sizeof(la), alen);
	memcpy(&la, addr, len);

	if (la.l2_cid && la.l2_psm)
		return -EINVAL;

	if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
		return -EINVAL;

	 
	if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
	    bdaddr_type_is_le(la.l2_bdaddr_type)) {
		 
		if (chan->scid != L2CAP_CID_ATT ||
		    la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
			return -EINVAL;

		 
		chan->src_type = BDADDR_LE_PUBLIC;
	}

	if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
		return -EINVAL;

	if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
		 
		if (la.l2_cid &&
		    la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
			return -EINVAL;
	}

	if (chan->psm && bdaddr_type_is_le(chan->src_type) && !chan->mode)
		chan->mode = L2CAP_MODE_LE_FLOWCTL;

	err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
				 &la.l2_bdaddr, la.l2_bdaddr_type);
	if (err)
		return err;

	lock_sock(sk);

	err = bt_sock_wait_state(sk, BT_CONNECTED,
				 sock_sndtimeo(sk, flags & O_NONBLOCK));

	release_sock(sk);

	return err;
}