linux-kernel - [PATCH net] net: xilinx: axienet: fix potential memory leak in axienet_start

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Message-ID: <20241014143704.31938-1-wanghai38@huawei.com>
Date: Mon, 14 Oct 2024 22:37:04 +0800
From: Wang Hai <wanghai38@...wei.com>
To: <radhey.shyam.pandey@....com>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<michal.simek@....com>, <andre.przywara@....com>, <zhangxiaoxu5@...wei.com>
CC: <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <wanghai38@...wei.com>
Subject: [PATCH net] net: xilinx: axienet: fix potential memory leak in axienet_start_xmit()

The axienet_start_xmit() returns NETDEV_TX_OK without freeing skb
in case of dma_map_single() fails, add dev_kfree_skb_any() to fix it.

Fixes: 71791dc8bdea ("net: axienet: Check for DMA mapping errors")
Signed-off-by: Wang Hai <wanghai38@...wei.com>
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index ea7d7c03f48e..53cf1a927278 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1046,6 +1046,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 		if (net_ratelimit())
 			netdev_err(ndev, "TX DMA mapping error\n");
 		ndev->stats.tx_dropped++;
+		dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
 	}
 	desc_set_phys_addr(lp, phys, cur_p);
@@ -1066,6 +1067,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 			ndev->stats.tx_dropped++;
 			axienet_free_tx_chain(lp, orig_tail_ptr, ii + 1,
 					      true, NULL, 0);
+			dev_kfree_skb_any(skb);
 			return NETDEV_TX_OK;
 		}
 		desc_set_phys_addr(lp, phys, cur_p);
-- 
2.17.1