linux-kernel - Re: [PATCH net] net: ethernet: aeroflex: fix potential memory leak in greth_start_xmit

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Message-ID: <539a13f9-d3b8-43f0-a5a4-158261408c07@huawei.com>
Date: Sat, 12 Oct 2024 19:16:02 +0800
From: Wang Hai <wanghai38@...wei.com>
To: Gerhard Engleder <gerhard@...leder-embedded.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<andreas@...sler.com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>, <kristoffer@...sler.com>
Subject: Re: [PATCH net] net: ethernet: aeroflex: fix potential memory leak in
 greth_start_xmit_gbit()


On 2024/10/12 4:41, Gerhard Engleder wrote:
> On 11.10.24 13:39, Wang Hai wrote:
>> The greth_start_xmit_gbit() returns NETDEV_TX_OK without freeing skb
>> in case of skb->len being too long, add dev_kfree_skb() to fix it.
>>
>> Fixes: d4c41139df6e ("net: Add Aeroflex Gaisler 10/100/1G Ethernet 
>> MAC driver")
>> Signed-off-by: Wang Hai <wanghai38@...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 27af7746d645..8f6835a710b9 100644
>> --- a/drivers/net/ethernet/aeroflex/greth.c
>> +++ b/drivers/net/ethernet/aeroflex/greth.c
>> @@ -484,6 +484,7 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct 
>> net_device *dev)
>>         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
>>           dev->stats.tx_errors++;
>> +        dev_kfree_skb(skb);
>>           goto out;
>
> dev_kfree_skb(skb) is already part of the error handling, one line above
> the "out" label. Why don't you just add another label which includes
> dev_kfree_skb(skb) and goto that label?
>
> Gerhard

Hi, Gerhard.

Thanks for the suggestion, I just sent the v2 version.

[PATCH v2 net] net: ethernet: aeroflex: fix potential memory leak in 
greth_start_xmit_gbit()