linux-kernel - Re: [PATCH v2] staging: rtl8192u: r8192U_core: Fix for possible null pointer dereference

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Message-ID: <20150205122745.GF5336@mwanda>
Date:	Thu, 5 Feb 2015 15:27:45 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	devel@...verdev.osuosl.org, Chaitanya Hazarey <c@...io>,
	linux-kernel@...r.kernel.org, Greg Donald <gdonald@...il.com>,
	Koray Gulcu <koray.gulcu@....edu.tr>
Subject: Re: [PATCH v2] staging: rtl8192u: r8192U_core: Fix for possible null
 pointer dereference

I don't know if this patch was merged before Greg cleaned out his inbox.

It's a good patch if you could just clean it up a bit.

On Thu, Jan 29, 2015 at 07:59:12PM +0100, Rickard Strandqvist wrote:
> Fix a possible null pointer dereference, there is
> otherwise a risk of a possible null pointer dereference.

The change log should say that "driver_info" is the NULL pointer.  It
should say that by default stats->RxIs40MHzPacket is zero (as opposed to
uninitialized memory).

> 
> This was found using a static code analysis program called cppcheck
> 
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>  drivers/staging/rtl8192u/r8192U_core.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
> index e031a25..4a29237 100644
> --- a/drivers/staging/rtl8192u/r8192U_core.c
> +++ b/drivers/staging/rtl8192u/r8192U_core.c
> @@ -4476,11 +4476,11 @@ static void query_rxdesc_status(struct sk_buff *skb,
>  
>  	/* for debug 2008.5.29 */
>  
> -	//added by vivi, for MP, 20080108
> -	stats->RxIs40MHzPacket = driver_info->BW;
> -	if (stats->RxDrvInfoSize != 0)
> +	if (driver_info && stats->RxDrvInfoSize != 0) {
> +		//added by vivi, for MP, 20080108

Delete these kinds of comments, please.


> +		stats->RxIs40MHzPacket = driver_info->BW;
>  		TranslateRxSignalStuff819xUsb(skb, stats, driver_info);
> -
> +	}

regards,
dan carpenter

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