static int hns_nic_rx_poll_one(struct hns_nic_ring_data *ring_data,
			       int budget, void *v)
{
	struct hnae_ring *ring = ring_data->ring;
	struct sk_buff *skb;
	int num, bnum;
#define RCB_NOF_ALLOC_RX_BUFF_ONCE 16
	int recv_pkts, recv_bds, clean_count, err;
	int unused_count = hns_desc_unused(ring);

	num = readl_relaxed(ring->io_base + RCB_REG_FBDNUM);
	rmb(); /* make sure num taken effect before the other data is touched */

	recv_pkts = 0, recv_bds = 0, clean_count = 0;
	num -= unused_count;

	while (recv_pkts < budget && recv_bds < num) {
		/* reuse or realloc buffers */
		if (clean_count + unused_count >= RCB_NOF_ALLOC_RX_BUFF_ONCE) {
			hns_nic_alloc_rx_buffers(ring_data,
						 clean_count + unused_count);
			clean_count = 0;
			unused_count = hns_desc_unused(ring);
		}

		/* poll one pkt */
		err = hns_nic_poll_rx_skb(ring_data, &skb, &bnum);
		if (unlikely(!skb)) /* this fault cannot be repaired */
			goto out;

		recv_bds += bnum;
		clean_count += bnum;
		if (unlikely(err)) {  /* do jump the err */
			recv_pkts++;
			continue;
		}

		/* do update ip stack process*/
		((void (*)(struct hns_nic_ring_data *, struct sk_buff *))v)(
							ring_data, skb);
		recv_pkts++;
	}

out:
	/* make all data has been write before submit */
	if (clean_count + unused_count > 0)
		hns_nic_alloc_rx_buffers(ring_data,
					 clean_count + unused_count);

	return recv_pkts;
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.