linux-kernel - Re: [PATCH net] net: bcmasp: fix potential memory leak in bcmasp

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Message-ID: <924f6a1b-17af-4dc8-80e3-7c7df687131a@broadcom.com>
Date: Mon, 14 Oct 2024 10:14:59 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Wang Hai <wanghai38@...wei.com>, justin.chen@...adcom.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, zhangxiaoxu5@...wei.com
Cc: bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: bcmasp: fix potential memory leak in
 bcmasp_xmit()

On 10/14/24 07:59, Wang Hai wrote:
> The bcmasp_xmit() returns NETDEV_TX_OK without freeing skb
> in case of mapping fails, add dev_kfree_skb() to fix it.
> 
> Fixes: 490cb412007d ("net: bcmasp: Add support for ASP2.0 Ethernet controller")
> Signed-off-by: Wang Hai <wanghai38@...wei.com>
> ---
>   drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
> index 82768b0e9026..9ea16ef4139d 100644
> --- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
> +++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
> @@ -322,6 +322,7 @@ static netdev_tx_t bcmasp_xmit(struct sk_buff *skb, struct net_device *dev)
>   			}
>   			/* Rewind so we do not have a hole */
>   			spb_index = intf->tx_spb_index;
> +			dev_kfree_skb(skb);

Similar reasoning to the change proposed to bcmsysport.c, we already 
have a private counter tracking DMA mapping errors, therefore I would 
consider using dev_consume_skb_any() here.
-- 
Florian