static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
			  struct netlink_ext_ack *extack)
{
	u8 proto;

	if (!data || !data[IFLA_IPTUN_PROTO])
		return 0;

	proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
	if (!ipip6_valid_ip_proto(proto))
		return -EINVAL;

	return 0;
}

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.