[PATCH net] net/qla3xxx: fix potential memleak in ql3xxx_send()

[PATCH net] net/qla3xxx: fix potential memleak in ql3xxx_send()

[Zhang Changzhong]

The ql3xxx_send() returns NETDEV_TX_OK without freeing skb in error
handling case, add dev_kfree_skb_any() to fix it.

Fixes: bd36b0ac5d06 ("qla3xxx: Add support for Qlogic 4032 chip.")
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
---
 drivers/net/ethernet/qlogic/qla3xxx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
index 76072f8..0d57ffc 100644
--- a/drivers/net/ethernet/qlogic/qla3xxx.c
+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
@@ -2471,6 +2471,7 @@ static netdev_tx_t ql3xxx_send(struct sk_buff *skb,
 					     skb_shinfo(skb)->nr_frags);
 	if (tx_cb->seg_count == -1) {
 		netdev_err(ndev, "%s: invalid segment count!\n", __func__);
+		dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
 	}
 
-- 
2.9.5

Re: [PATCH net] net/qla3xxx: fix potential memleak in ql3xxx_send()

[Leon Romanovsky]

On Thu, Nov 17, 2022 at 04:50:38PM +0800, Zhang Changzhong wrote:
> The ql3xxx_send() returns NETDEV_TX_OK without freeing skb in error
> handling case, add dev_kfree_skb_any() to fix it.

Can you please remind me why should it release?
There are no paths in ql3xxx_send() that release skb.

Thanks

> 
> Fixes: bd36b0ac5d06 ("qla3xxx: Add support for Qlogic 4032 chip.")
> Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
> ---
>  drivers/net/ethernet/qlogic/qla3xxx.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
> index 76072f8..0d57ffc 100644
> --- a/drivers/net/ethernet/qlogic/qla3xxx.c
> +++ b/drivers/net/ethernet/qlogic/qla3xxx.c
> @@ -2471,6 +2471,7 @@ static netdev_tx_t ql3xxx_send(struct sk_buff *skb,
>  					     skb_shinfo(skb)->nr_frags);
>  	if (tx_cb->seg_count == -1) {
>  		netdev_err(ndev, "%s: invalid segment count!\n", __func__);
> +		dev_kfree_skb_any(skb);
>  		return NETDEV_TX_OK;
>  	}
>  
> -- 
> 2.9.5
> 

Re: [PATCH net] net/qla3xxx: fix potential memleak in ql3xxx_send()

[Zhang Changzhong]

On 2022/11/17 19:38, Leon Romanovsky wrote:
> On Thu, Nov 17, 2022 at 04:50:38PM +0800, Zhang Changzhong wrote:
>> The ql3xxx_send() returns NETDEV_TX_OK without freeing skb in error
>> handling case, add dev_kfree_skb_any() to fix it.
> 
> Can you please remind me why should it release?
> There are no paths in ql3xxx_send() that release skb.
> 
> Thanks
> 

If ql_send_map() returns NETDEV_TX_OK, the packet is sent, and
ql_process_mac_tx_intr() releases tx_cb->skb. However, the skb
cannot be released in this error path.

Thanks,
Changzhong

>>
>> Fixes: bd36b0ac5d06 ("qla3xxx: Add support for Qlogic 4032 chip.")
>> Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
>> ---
>>  drivers/net/ethernet/qlogic/qla3xxx.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
>> index 76072f8..0d57ffc 100644
>> --- a/drivers/net/ethernet/qlogic/qla3xxx.c
>> +++ b/drivers/net/ethernet/qlogic/qla3xxx.c
>> @@ -2471,6 +2471,7 @@ static netdev_tx_t ql3xxx_send(struct sk_buff *skb,
>>  					     skb_shinfo(skb)->nr_frags);
>>  	if (tx_cb->seg_count == -1) {
>>  		netdev_err(ndev, "%s: invalid segment count!\n", __func__);
>> +		dev_kfree_skb_any(skb);
>>  		return NETDEV_TX_OK;
>>  	}
>>  
>> -- 
>> 2.9.5
>>
> .
> 

Re: [PATCH net] net/qla3xxx: fix potential memleak in ql3xxx_send()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 17 Nov 2022 16:50:38 +0800 you wrote:
> The ql3xxx_send() returns NETDEV_TX_OK without freeing skb in error
> handling case, add dev_kfree_skb_any() to fix it.
> 
> Fixes: bd36b0ac5d06 ("qla3xxx: Add support for Qlogic 4032 chip.")
> Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
> ---
>  drivers/net/ethernet/qlogic/qla3xxx.c | 1 +
>  1 file changed, 1 insertion(+)

Here is the summary with links:
  - [net] net/qla3xxx: fix potential memleak in ql3xxx_send()
    https://git.kernel.org/netdev/net/c/62a7311fb96c

You are awesome, thank you!
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