net: hns3: fix for use-after-free when setting ring parameter

In hns3_set_ringparam, hns3_uninit_all_ring frees the
memory pointed by priv->ring_data[i].ring, and
hns3_change_all_ring_bd_num use that pointer without mallocing,
which will cause a use-after-free problem.

The patch fixes it by not freeing the memory in
hns3_uninit_all_ring, and uses hns3_put_ring_config to free it
when necessary.
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -2967,13 +2967,8 @@ int hns3_uninit_all_ring(struct hns3_nic_priv *priv)
 			h->ae_algo->ops->reset_queue(h, i);
 
 		hns3_fini_ring(priv->ring_data[i].ring);
-		devm_kfree(priv->dev, priv->ring_data[i].ring);
 		hns3_fini_ring(priv->ring_data[i + h->kinfo.num_tqps].ring);
-		devm_kfree(priv->dev,
-			   priv->ring_data[i + h->kinfo.num_tqps].ring);
 	}
-	devm_kfree(priv->dev, priv->ring_data);
-
 	return 0;
 }
 
@@ -3111,6 +3106,8 @@ static void hns3_client_uninit(struct hnae3_handle *handle, bool reset)
 	if (ret)
 		netdev_err(netdev, "uninit ring error\n");
 
+	hns3_put_ring_config(priv);
+
 	priv->ring_data = NULL;
 
 	free_netdev(netdev);
@@ -3316,6 +3313,8 @@ static int hns3_reset_notify_uninit_enet(struct hnae3_handle *handle)
 	if (ret)
 		netdev_err(netdev, "uninit ring error\n");
 
+	hns3_put_ring_config(priv);
+
 	priv->ring_data = NULL;
 
 	return ret;
@@ -3422,6 +3421,7 @@ int hns3_set_channels(struct net_device *netdev,
 	}
 
 	hns3_uninit_all_ring(priv);
+	hns3_put_ring_config(priv);
 
 	org_tqp_num = h->kinfo.num_tqps;
 	ret = hns3_modify_tqp_num(netdev, new_tqp_num);