netdev - [PATCH v2 net] net: ethernet: aeroflex: fix potential memory leak in greth_start_xmit

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Message-ID: <20241012110434.49265-1-wanghai38@huawei.com>
Date: Sat, 12 Oct 2024 19:04:34 +0800
From: Wang Hai <wanghai38@...wei.com>
To: <andreas@...sler.com>, <gerhard@...leder-embedded.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <zhangxiaoxu5@...wei.com>, <kristoffer@...sler.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<wanghai38@...wei.com>
Subject: [PATCH v2 net] net: ethernet: aeroflex: fix potential memory leak in greth_start_xmit_gbit()

The greth_start_xmit_gbit() returns NETDEV_TX_OK without freeing skb
in case of skb->len being too long, add dev_kfree_skb() to fix it.

Fixes: d4c41139df6e ("net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driver")
Signed-off-by: Wang Hai <wanghai38@...wei.com>
---
v1->v2: Using dev_kfree_skb() in error handling.
 drivers/net/ethernet/aeroflex/greth.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c
index 27af7746d645..adf6f67c5fcb 100644
--- a/drivers/net/ethernet/aeroflex/greth.c
+++ b/drivers/net/ethernet/aeroflex/greth.c
@@ -484,7 +484,7 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 
 	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 		dev->stats.tx_errors++;
-		goto out;
+		goto len_error;
 	}
 
 	/* Save skb pointer. */
@@ -575,6 +575,7 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 map_error:
 	if (net_ratelimit())
 		dev_warn(greth->dev, "Could not create TX DMA mapping\n");
+len_error:
 	dev_kfree_skb(skb);
 out:
 	return err;
-- 
2.17.1