linux-kernel - [PATCH net] ethernet: aeroflex: fix potential skb leak in greth_init

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Message-ID: <1670134149-29516-1-git-send-email-zhangchangzhong@huawei.com>
Date:   Sun, 4 Dec 2022 14:09:08 +0800
From:   Zhang Changzhong <zhangchangzhong@...wei.com>
To:     Andreas Larsson <andreas@...sler.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kristoffer Glembo <kristoffer@...sler.com>
CC:     Zhang Changzhong <zhangchangzhong@...wei.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH net] ethernet: aeroflex: fix potential skb leak in greth_init_rings()

The greth_init_rings() function won't free the newly allocated skb when
dma_mapping_error() returns error, so add dev_kfree_skb() to fix it.

Compile tested only.

Fixes: d4c41139df6e ("net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driver")
Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>
---
 drivers/net/ethernet/aeroflex/greth.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c
index e104fb0..aa0d2f3 100644
--- a/drivers/net/ethernet/aeroflex/greth.c
+++ b/drivers/net/ethernet/aeroflex/greth.c
@@ -258,6 +258,7 @@ static int greth_init_rings(struct greth_private *greth)
 			if (dma_mapping_error(greth->dev, dma_addr)) {
 				if (netif_msg_ifup(greth))
 					dev_err(greth->dev, "Could not create initial DMA mapping\n");
+				dev_kfree_skb(skb);
 				goto cleanup;
 			}
 			greth->rx_skbuff[i] = skb;
-- 
2.9.5