static int virtnet_busy_poll(struct napi_struct *napi)
{
	struct receive_queue *rq =
		container_of(napi, struct receive_queue, napi);
	struct virtnet_info *vi = rq->vq->vdev->priv;
	int r, received = 0, budget = 4;

	if (!(vi->status & VIRTIO_NET_S_LINK_UP))
		return LL_FLUSH_FAILED;

	if (!napi_schedule_prep(napi))
		return LL_FLUSH_BUSY;

	virtqueue_disable_cb(rq->vq);

again:
	received += virtnet_receive(rq, budget);

	r = virtqueue_enable_cb_prepare(rq->vq);
	clear_bit(NAPI_STATE_SCHED, &napi->state);
	if (unlikely(virtqueue_poll(rq->vq, r)) &&
	    napi_schedule_prep(napi)) {
		virtqueue_disable_cb(rq->vq);
		if (received < budget) {
			budget -= received;
			goto again;
		} else {
			__napi_schedule(napi);
		}
	}

	return received;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.