netdev - Re: [PATCH net] mlxsw: minimal: fix potential memory leak in mlxsw_m_linecards

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Date:   Wed, 28 Jun 2023 12:03:14 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     Zhengchao Shao <shaozhengchao@...wei.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, petrm@...dia.com,
        jiri@...nulli.us, vadimp@...dia.com, yuehaibing@...wei.com
Subject: Re: [PATCH net] mlxsw: minimal: fix potential memory leak in
 mlxsw_m_linecards_init

On Wed, Jun 28, 2023 at 08:54:10AM +0800, Zhengchao Shao wrote:
> when allocating mlxsw_m->line_cards[] failed in mlxsw_m_linecards_init,

s/when/When/
s/allocating/the allocation of/
s/failed/fails/

> the memory pointed by mlxsw_m->line_cards is not released, which will
> cause memory leak. Memory release processing is added to the incorrect
> path.

Last sentence should be reworded to imperative mood.

Personally, I would reword the commit message to something like:

"
The line cards array is not freed in the error path of
mlxsw_m_linecards_init(), which can lead to a memory leak. Fix by
freeing the array in the error path, thereby making the error path
identical to mlxsw_m_linecards_fini().
"

Thanks

> 
> Fixes: 01328e23a476 ("mlxsw: minimal: Extend module to port mapping with slot index")
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
> ---
>  drivers/net/ethernet/mellanox/mlxsw/minimal.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/minimal.c b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
> index 6b56eadd736e..6b98c3287b49 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/minimal.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
> @@ -417,6 +417,7 @@ static int mlxsw_m_linecards_init(struct mlxsw_m *mlxsw_m)
>  err_kmalloc_array:
>  	for (i--; i >= 0; i--)
>  		kfree(mlxsw_m->line_cards[i]);
> +	kfree(mlxsw_m->line_cards);
>  err_kcalloc:
>  	kfree(mlxsw_m->ports);
>  	return err;
> -- 
> 2.34.1
>