static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
			  unsigned long cl,
			  u32 pid, u32 seq, u16 flags, int event)
{
	struct tcmsg *tcm;
	struct nlmsghdr  *nlh;
	unsigned char *b = skb_tail_pointer(skb);
	struct gnet_dump d;
	const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;

	nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
	tcm = NLMSG_DATA(nlh);
	tcm->tcm_family = AF_UNSPEC;
	tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
	tcm->tcm_parent = q->handle;
	tcm->tcm_handle = q->handle;
	tcm->tcm_info = 0;
	NLA_PUT_STRING(skb, TCA_KIND, q->ops->id);
	if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
		goto nla_put_failure;

	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
					 qdisc_root_sleeping_lock(q), &d) < 0)
		goto nla_put_failure;

	if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
		goto nla_put_failure;

	if (gnet_stats_finish_copy(&d) < 0)
		goto nla_put_failure;

	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
	return skb->len;

nlmsg_failure:
nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}
The product does not initialize a critical resource.