From: Sameeh Jubran <sameehj@amazon.com>
Date: Wed, 3 Jun 2020 08:50:22 +0000 (+0000)
Subject: net: ena: xdp: XDP_TX: fix memory leak
X-Git-Tag: v5.7.3~156
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=711f2c6c4969c093ec3bfccf9bc45e0d819c51f5;p=users%2Fdwmw2%2Flinux.git

net: ena: xdp: XDP_TX: fix memory leak

[ Upstream commit cd07ecccba13b8bd5023ffe7be57363d07e3105f ]

When sending very high packet rate, the XDP tx queues can get full and
start dropping packets. In this case we don't free the pages which
results in ena driver draining the system memory.

Fix:
Simply free the pages when necessary.

Fixes: 548c4940b9f1 ("net: ena: Implement XDP_TX action")
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 2cc765df8da35..23f96d300bfa8 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -355,7 +355,7 @@ error_unmap_dma:
 	ena_unmap_tx_buff(xdp_ring, tx_info);
 	tx_info->xdpf = NULL;
 error_drop_packet:
-
+	__free_page(tx_info->xdp_rx_page);
 	return NETDEV_TX_OK;
 }