static int __br_mdb_add(struct net *net, struct net_bridge *br,
			struct br_mdb_entry *entry)
{
	struct br_ip ip;
	struct net_device *dev;
	struct net_bridge_port *p;
	int ret;

	if (!netif_running(br->dev) || br->multicast_disabled)
		return -EINVAL;

	dev = __dev_get_by_index(net, entry->ifindex);
	if (!dev)
		return -ENODEV;

	p = br_port_get_rtnl(dev);
	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
		return -EINVAL;

	ip.proto = entry->addr.proto;
	if (ip.proto == htons(ETH_P_IP))
		ip.u.ip4 = entry->addr.u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
	else
		ip.u.ip6 = entry->addr.u.ip6;
#endif

	spin_lock_bh(&br->multicast_lock);
	ret = br_mdb_add_group(br, p, &ip, entry->state);
	spin_unlock_bh(&br->multicast_lock);
	return ret;
}

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.