static int hns_nic_set_features(struct net_device *netdev,
				netdev_features_t features)
{
	struct hns_nic_priv *priv = netdev_priv(netdev);

	switch (priv->enet_ver) {
	case AE_VERSION_1:
		if (features & (NETIF_F_TSO | NETIF_F_TSO6))
			netdev_info(netdev, "enet v1 do not support tso!\n");
		break;
	default:
		if (features & (NETIF_F_TSO | NETIF_F_TSO6)) {
			priv->ops.fill_desc = fill_tso_desc;
			priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tso;
			/* The chip only support 7*4096 */
			netif_set_gso_max_size(netdev, 7 * 4096);
		} else {
			priv->ops.fill_desc = fill_v2_desc;
			priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tx;
		}
		break;
	}
	netdev->features = features;
	return 0;
}

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 Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.