linux-kernel - Re: [PATCH] net/mlx4_en: Fix a memory leak in case of error in 'mlx4_en_init

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Message-ID: <a61ed690-7df1-7292-4074-3f7d66c0b490@mellanox.com>
Date:   Mon, 12 Mar 2018 10:42:56 +0200
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        tariqt@...lanox.com
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] net/mlx4_en: Fix a memory leak in case of error in
 'mlx4_en_init_netdev()'



On 12/03/2018 12:45 AM, Christophe JAILLET wrote:
> If 'kzalloc' fails, we must free some memory before returning.
> 
> Fixes: 67f8b1dcb9ee ("net/mlx4_en: Refactor the XDP forwarding rings scheme")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>   drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index 8fc51bc29003..f9db018e858f 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -3327,7 +3327,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
>   		if (!priv->tx_cq[t]) {
>   			kfree(priv->tx_ring[t]);
>   			err = -ENOMEM;
> -			goto out;
> +			goto err_free_tx;
>   		}
>   	}
>   	priv->rx_ring_num = prof->rx_ring_num;
> 

Hi Christophe, thanks for spotting this.

However, I think these err_free_tx label and loop are redundant.
Both tx_ring/tx_cq flows should just goto out, as resources are freed 
later in mlx4_en_destroy_netdev() -> mlx4_en_free_resources().