int netlink_add_tap(struct netlink_tap *nt)
{
	if (unlikely(nt->dev->type != ARPHRD_NETLINK))
		return -EINVAL;

	spin_lock(&netlink_tap_lock);
	list_add_rcu(&nt->list, &netlink_tap_all);
	spin_unlock(&netlink_tap_lock);

	if (nt->module)
		__module_get(nt->module);

	return 0;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.