linux-kernel - Re: [PATCH net] net: ethernet: rtsn: fix potential memory leak in rtsn_start

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Message-ID: <20241014205044.GA2838422@ragnatech.se>
Date: Mon, 14 Oct 2024 22:50:44 +0200
From: Niklas Söderlund <niklas.soderlund@...natech.se>
To: Wang Hai <wanghai38@...wei.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, andrew@...n.ch, zhangxiaoxu5@...wei.com,
	netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: ethernet: rtsn: fix potential memory leak in
 rtsn_start_xmit()

Hello Wang,

Thanks for finding this.

On 2024-10-14 22:42:50 +0800, Wang Hai wrote:
> The rtsn_start_xmit() returns NETDEV_TX_OK without freeing skb
> in case of skb->len being too long, add dev_kfree_skb_any() to fix it.
> 
> Fixes: b0d3969d2b4d ("net: ethernet: rtsn: Add support for Renesas Ethernet-TSN")
> Signed-off-by: Wang Hai <wanghai38@...wei.com>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
>  drivers/net/ethernet/renesas/rtsn.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/renesas/rtsn.c b/drivers/net/ethernet/renesas/rtsn.c
> index f9f63c61d792..6b3f7fca8d15 100644
> --- a/drivers/net/ethernet/renesas/rtsn.c
> +++ b/drivers/net/ethernet/renesas/rtsn.c
> @@ -1057,6 +1057,7 @@ static netdev_tx_t rtsn_start_xmit(struct sk_buff *skb, struct net_device *ndev)
>  	if (skb->len >= TX_DS) {
>  		priv->stats.tx_dropped++;
>  		priv->stats.tx_errors++;
> +		dev_kfree_skb_any(skb);
>  		goto out;
>  	}
>  
> -- 
> 2.17.1
> 

-- 
Kind Regards,
Niklas Söderlund