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

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Date:   Thu, 29 Jun 2023 11:18:22 -0700
From:   Rahul Rameshbabu <rrameshbabu@...dia.com>
To:     Zhengchao Shao <shaozhengchao@...wei.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 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);

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.

>  	return err;

Thanks for the patch,

-- Rahul Rameshbabu