linux-kernel - Re: [PATCH v3] staging: vt6655: check for memory allocation failures

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Date:   Fri, 30 Mar 2018 11:15:03 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     Ji-Hun Kim <ji_hun.kim@...sung.com>, gregkh@...uxfoundation.org,
        forest@...ttletooquiet.net
Cc:     dartnorris@...il.com, santhameena13@...il.com,
        julia.lawall@...6.fr, y.k.oh@...sung.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v3] staging: vt6655: check for memory allocation failures



On 2018/3/30 10:44, Ji-Hun Kim wrote:
> @@ -1165,10 +1205,18 @@ static int vnt_start(struct ieee80211_hw *hw)
>   	}
>   
>   	dev_dbg(&priv->pcid->dev, "call device init rd0 ring\n");
> -	device_init_rd0_ring(priv);
> -	device_init_rd1_ring(priv);
> -	device_init_td0_ring(priv);
> -	device_init_td1_ring(priv);
> +	ret = device_init_rd0_ring(priv);
> +	if (ret)
> +		goto error;
> +	ret = device_init_rd1_ring(priv);
> +	if (ret)
> +		goto error;
> +	ret = device_init_td0_ring(priv);
> +	if (ret)
> +		goto error;
> +	ret = device_init_td1_ring(priv);
> +	if (ret)
> +		goto error;
>   
>   	device_init_registers(priv);
>   
> @@ -1178,6 +1226,8 @@ static int vnt_start(struct ieee80211_hw *hw)
>   	ieee80211_wake_queues(hw);
>   
>   	return 0;
> +error:
> +	return ret;
>   }

This code will lead to memory leaks when device_init_rd1_ring() fails, 
because the memory allocated by device_init_rd0_ring() is not freed.

I think this one will be better:
     ret = device_init_rd0_ring(priv);
     if (ret)
         goto error_init_rd0_ring;
     ret = device_init_rd1_ring(priv);
     if (ret)
         goto error_init_rd1_ring;
     ret = device_init_td0_ring(priv);
     if (ret)
         goto error_init_td0_ring;
     ret = device_init_td1_ring(priv);
     if (ret)
         goto error_init_td1_ring;
     ......
error_init_td1_ring:
     device_free_td0_ring(priv);
error_init_td0_ring:
     device_free_rd1_ring(priv);
error_init_rd1_ring:
     device_free_rd0_ring(priv);
error_init_rd0_ring:
     return ret;


Best wishes,
Jia-Ju Bai