netdev - Re: [PATCH net 1/2] net/mlx5e: fix memory leak in mlx5e_fs_tt_redirect_any

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Date: Fri, 30 Jun 2023 09:27:52 +0800
From: shaozhengchao <shaozhengchao@...wei.com>
To: Rahul Rameshbabu <rrameshbabu@...dia.com>
CC: <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <richardcochran@...il.com>, <saeedm@...dia.com>,
	<leon@...nel.org>, <lkayal@...dia.com>, <tariqt@...dia.com>,
	<gal@...dia.com>, <vadfed@...a.com>, <ayal@...dia.com>, <eranbe@...dia.com>,
	<weiyongjun1@...wei.com>, <yuehaibing@...wei.com>
Subject: Re: [PATCH net 1/2] net/mlx5e: fix memory leak in
 mlx5e_fs_tt_redirect_any_create



On 2023/6/30 2:18, Rahul Rameshbabu wrote:
> On Thu, 29 Jun, 2023 10:46:41 +0800 Zhengchao Shao <shaozhengchao@...wei.com> wrote:
>> The memory pointed to by the fs->any pointer is not freed in the error
>> path of mlx5e_fs_tt_redirect_any_create, which can lead to a memory leak.
>> Fix by freeing the memory in the error path, thereby making the error path
>> identical to mlx5e_fs_tt_redirect_any_destroy().
>>
>> Fixes: 0f575c20bf06 ("net/mlx5e: Introduce Flow Steering ANY API")
>> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
>> ---
>>   drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
>> index 03cb79adf912..9cf4ec931b8b 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
>> @@ -594,7 +594,7 @@ int mlx5e_fs_tt_redirect_any_create(struct mlx5e_flow_steering *fs)
>>   
>>   	err = fs_any_create_table(fs);
>>   	if (err)
>> -		return err;
>> +		goto err_free_any;
>>   
>>   	err = fs_any_enable(fs);
>>   	if (err)
>> @@ -606,7 +606,7 @@ int mlx5e_fs_tt_redirect_any_create(struct mlx5e_flow_steering *fs)
>>   
>>   err_destroy_table:
>>   	fs_any_destroy_table(fs_any);
>> -
>> +err_free_any:
>>   	kfree(fs_any);
>>   	mlx5e_fs_set_any(fs, NULL);
> 
Hi Rahul:
> We probably should update the 'any' member reference in fs to NULL
> *before* free-ing fs_any. Otherwise, there is a period in time where fs
> is referring to a dirty pointer value in its any member field. It's not
> critical, but it makes logical sense in my opinion. Lets swap these two
> lines in this patch.
> 
	It looks good. I will send V2. Thank you.

Zhengchao Shao
>>   	return err;
> 
> Thanks for the patch,
> 
> -- Rahul Rameshbabu