net/sun3_82586: fix potential memory leak in sun3_82586_send_packet()

[PATCH net] net/sun3_82586: fix potential memory leak in sun3_82586_send_packet()

Posted by Wang Hai 1 month, 1 week ago

The sun3_82586_send_packet() returns NETDEV_TX_OK without freeing skb
in case of skb->len being too long, add dev_kfree_skb() to fix it.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Wang Hai <wanghai38@huawei.com>
---
 drivers/net/ethernet/i825xx/sun3_82586.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/i825xx/sun3_82586.c b/drivers/net/ethernet/i825xx/sun3_82586.c
index f2d4669c81cf..58a3d28d938c 100644
--- a/drivers/net/ethernet/i825xx/sun3_82586.c
+++ b/drivers/net/ethernet/i825xx/sun3_82586.c
@@ -1012,6 +1012,7 @@ sun3_82586_send_packet(struct sk_buff *skb, struct net_device *dev)
 	if(skb->len > XMIT_BUFF_SIZE)
 	{
 		printk("%s: Sorry, max. framelength is %d bytes. The length of your frame is %d bytes.\n",dev->name,XMIT_BUFF_SIZE,skb->len);
+		dev_kfree_skb(skb);
 		return NETDEV_TX_OK;
 	}
 
-- 
2.17.1

Re: [PATCH net] net/sun3_82586: fix potential memory leak in sun3_82586_send_packet()

Posted by Simon Horman 1 month, 1 week ago

On Tue, Oct 15, 2024 at 10:41:48PM +0800, Wang Hai wrote:
> The sun3_82586_send_packet() returns NETDEV_TX_OK without freeing skb
> in case of skb->len being too long, add dev_kfree_skb() to fix it.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Wang Hai <wanghai38@huawei.com>
> ---
>  drivers/net/ethernet/i825xx/sun3_82586.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/i825xx/sun3_82586.c b/drivers/net/ethernet/i825xx/sun3_82586.c
> index f2d4669c81cf..58a3d28d938c 100644
> --- a/drivers/net/ethernet/i825xx/sun3_82586.c
> +++ b/drivers/net/ethernet/i825xx/sun3_82586.c
> @@ -1012,6 +1012,7 @@ sun3_82586_send_packet(struct sk_buff *skb, struct net_device *dev)
>  	if(skb->len > XMIT_BUFF_SIZE)
>  	{
>  		printk("%s: Sorry, max. framelength is %d bytes. The length of your frame is %d bytes.\n",dev->name,XMIT_BUFF_SIZE,skb->len);
> +		dev_kfree_skb(skb);
>  		return NETDEV_TX_OK;
>  	}

Thanks,

I agree that:
* This code-change is correct,
* and in keeping with other code in this function.
* And I agree that this problem goes back to the beginning of git history

Reviewed-by: Simon Horman <horms@kernel.org>