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

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Message-ID: <f275b30a-4892-4867-936f-c8de41c05b9e@huawei.com>
Date: Tue, 15 Oct 2024 22:52:08 +0800
From: Wang Hai <wanghai38@...wei.com>
To: Florian Fainelli <florian.fainelli@...adcom.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 2024/10/15 1:14, Florian Fainelli wrote:
> 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.

Hi, Florian.

Thanks for the suggestion, I've resent v2.

[PATCH v2 net] net: bcmasp: fix potential memory leak in bcmasp_xmit()