vsock/virtio: add WARN_ON check on virtio_transport_get_ops()

{

	const struct vsock_transport *t = vsock_core_get_transport(vsk);

	if (WARN_ON(!t))

		return NULL;

	return container_of(t, struct virtio_transport, transport);

}

}

EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);

/* This function can only be used on connecting/connected sockets,

 * since a socket assigned to a transport is required.

 *

 * Do not use on listener sockets!

 */

static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,

					  struct virtio_vsock_pkt_info *info)

{

	u32 src_cid, src_port, dst_cid, dst_port;

	const struct virtio_transport *t_ops;

	struct virtio_vsock_sock *vvs;

	struct virtio_vsock_pkt *pkt;

	u32 pkt_len = info->pkt_len;

	src_cid = virtio_transport_get_ops(vsk)->transport.get_local_cid();

	t_ops = virtio_transport_get_ops(vsk);

	if (unlikely(!t_ops))

		return -EFAULT;

	src_cid = t_ops->transport.get_local_cid();

	src_port = vsk->local_addr.svm_port;

	if (!info->remote_cid) {

		dst_cid	= vsk->remote_addr.svm_cid;

	virtio_transport_inc_tx_pkt(vvs, pkt);

	return virtio_transport_get_ops(vsk)->send_pkt(pkt);

	return t_ops->send_pkt(pkt);

}

static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,