linux-kernel - Re: [PATCH] gpsca: remove the risk of a division by zero

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Message-ID: <20150209101846.GA28420@biggie>
Date:	Mon, 9 Feb 2015 10:18:46 +0000
From:	Luis de Bethencourt <luis@...ethencourt.com>
To:	linux-media@...r.kernel.org
Cc:	mchehab@....samsung.com, hdegoede@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpsca: remove the risk of a division by zero

On Mon, Feb 09, 2015 at 10:16:25AM +0000, Luis de Bethencourt wrote:
> As reported by Peter Kovar, there's a potential risk of a division by zero on
> calls to jpeg_set_qual() when quality is zero.
> 
> As quality can't be 0 or lower than that, add an extra clause to cover this
> special case.
> 
> Signed-off-by: Luis de Bethencourt <luis.bg@...sung.com>
> ---
>  drivers/media/usb/gspca/topro.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/gspca/topro.c b/drivers/media/usb/gspca/topro.c
> index 5fcd1ee..c70ff40 100644
> --- a/drivers/media/usb/gspca/topro.c
> +++ b/drivers/media/usb/gspca/topro.c
> @@ -969,7 +969,9 @@ static void jpeg_set_qual(u8 *jpeg_hdr,
>  {
>  	int i, sc;
>  
> -	if (quality < 50)
> +	if (quality <= 0)
> +		sc = 5000;
> +	else if (quality < 50)
>  		sc = 5000 / quality;
>  	else
>  		sc = 200 - quality * 2;
> -- 
> 2.1.3
> 

Reported here:
http://www.mail-archive.com/linux-media@vger.kernel.org/msg84989.html

Thanks :)
Luis
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