static int hns_nic_common_poll(struct napi_struct *napi, int budget)
{
	int clean_complete = 0;
	struct hns_nic_ring_data *ring_data =
		container_of(napi, struct hns_nic_ring_data, napi);
	struct hnae_ring *ring = ring_data->ring;

try_again:
	clean_complete += ring_data->poll_one(
				ring_data, budget - clean_complete,
				ring_data->ex_process);

	if (clean_complete < budget) {
		if (ring_data->fini_process(ring_data)) {
			napi_complete(napi);
			ring->q->handle->dev->ops->toggle_ring_irq(ring, 0);
		} else {
			goto try_again;
		}
	}

	return clean_complete;
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.