linux-kernel - Re: [PATCH] staging: rtl8712: avoid a useless call to memset().

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Date:	Wed, 05 Dec 2012 09:12:57 +0100
From:	walter harms <wharms@....de>
To:	Cyril Roelandt <tipecaml@...il.com>
CC:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
	gregkh@...uxfoundation.org, yongjun_wei@...ndmicro.com.cn,
	jim.cromie@...il.com, marcos.souza.org@...il.com,
	devel@...verdev.osuosl.org
Subject: Re: [PATCH] staging: rtl8712: avoid a useless call to memset().

Hi Cyril,
you patch is correct ..but being an advocate of defensive programming
i would say the original version especially since the number of bytes is small.

re,
 wh

Am 05.12.2012 02:22, schrieb Cyril Roelandt:
> In r8711_wx_get_wap(), make sure we do not call memcpy() on a memory area that
> has just been zeroed by a call to memset().
> 
> Signed-off-by: Cyril Roelandt <tipecaml@...il.com>
> ---
>  drivers/staging/rtl8712/rtl871x_ioctl_linux.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
> index 3a64790..2c73319 100644
> --- a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
> +++ b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
> @@ -1131,10 +1131,11 @@ static int r8711_wx_get_wap(struct net_device *dev,
>  	struct ndis_wlan_bssid_ex *pcur_bss = &pmlmepriv->cur_network.network;
>  
>  	wrqu->ap_addr.sa_family = ARPHRD_ETHER;
> -	memset(wrqu->ap_addr.sa_data, 0, ETH_ALEN);
>  	if (check_fwstate(pmlmepriv, _FW_LINKED |
>  	    WIFI_ADHOC_MASTER_STATE|WIFI_AP_STATE)) {
>  		memcpy(wrqu->ap_addr.sa_data, pcur_bss->MacAddress, ETH_ALEN);
> +	} else {
> +		memset(wrqu->ap_addr.sa_data, 0, ETH_ALEN);
>  	}
>  	return 0;
>  }
--
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