void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
                                               bool set_handler)
{
    if (assign && set_handler) {
        event_notifier_set_handler(&vq->host_notifier,
                                   virtio_queue_host_notifier_read);
    } else {
        event_notifier_set_handler(&vq->host_notifier, NULL);
    }
    if (!assign) {
        /* Test and clear notifier before after disabling event,
         * in case poll callback didn't have time to run. */
        virtio_queue_host_notifier_read(&vq->host_notifier);
    }
}

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.