static int process_backlog(struct napi_struct *napi, int quota)
{
	struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
	bool again = true;
	int work = 0;

	/* Check if we have pending ipi, its better to send them now,
	 * not waiting net_rx_action() end.
	 */
	if (sd_has_rps_ipi_waiting(sd)) {
		local_irq_disable();
		net_rps_action_and_irq_enable(sd);
	}

	napi->weight = dev_rx_weight;
	while (again) {
		struct sk_buff *skb;

		while ((skb = __skb_dequeue(&sd->process_queue))) {
			rcu_read_lock();
			__netif_receive_skb(skb);
			rcu_read_unlock();
			input_queue_head_incr(sd);
			if (++work >= quota)
				return work;

		}

		local_irq_disable();
		rps_lock(sd);
		if (skb_queue_empty(&sd->input_pkt_queue)) {
			/*
			 * Inline a custom version of __napi_complete().
			 * only current cpu owns and manipulates this napi,
			 * and NAPI_STATE_SCHED is the only possible flag set
			 * on backlog.
			 * We can use a plain write instead of clear_bit(),
			 * and we dont need an smp_mb() memory barrier.
			 */
			napi->state = 0;
			again = false;
		} else {
			skb_queue_splice_tail_init(&sd->input_pkt_queue,
						   &sd->process_queue);
		}
		rps_unlock(sd);
		local_irq_enable();
	}

	return work;
}

The product dereferences a pointer that it expects to be valid but is NULL.