linux-kernel - [PATCH net] ravb: Fix potential use-after-free in ravb_rx

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Message-ID: <20221203092941.10880-1-yuehaibing@huawei.com>
Date:   Sat, 3 Dec 2022 17:29:41 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <s.shtylyov@....ru>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>,
        <phil.edworthy@...esas.com>, <biju.das.jz@...renesas.com>,
        <prabhakar.mahadev-lad.rj@...renesas.com>
CC:     <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH net] ravb: Fix potential use-after-free in ravb_rx_gbeth()

The skb is delivered to napi_gro_receive() which may free it, after calling this,
dereferencing skb may trigger use-after-free.

Fixes: 1c59eb678cbd ("ravb: Fillup ravb_rx_gbeth() stub")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 6bc923326268..33f723a9f471 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -841,7 +841,7 @@ static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
 				napi_gro_receive(&priv->napi[q],
 						 priv->rx_1st_skb);
 				stats->rx_packets++;
-				stats->rx_bytes += priv->rx_1st_skb->len;
+				stats->rx_bytes += pkt_len;
 				break;
 			}
 		}
-- 
2.34.1