static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
                                struct iovec *iov, unsigned int iov_cnt)
{
    VirtIODevice *vdev = VIRTIO_DEVICE(n);
    struct virtio_net_ctrl_mq mq;
    size_t s;
    uint16_t queues;

    s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
    if (s != sizeof(mq)) {
        return VIRTIO_NET_ERR;
    }

    if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
        return VIRTIO_NET_ERR;
    }

    queues = lduw_p(&mq.virtqueue_pairs);

    if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
        queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
        queues > n->max_queues ||
        !n->multiqueue) {
        return VIRTIO_NET_ERR;
    }

    n->curr_queues = queues;
    /* stop the backend before changing the number of queues to avoid handling a
     * disabled queue */
    virtio_net_set_status(vdev, vdev->status);
    virtio_net_set_queues(n);

    return VIRTIO_NET_OK;
}

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.