linux-kernel - Re: [PATCH] video: kyro: fix incorrect sizes when copying to userspace

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Date:	Tue, 26 Nov 2013 16:40:54 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Sasha Levin <sasha.levin@...cle.com>, <plagnioj@...osoft.com>
CC:	<gregkh@...uxfoundation.org>, <linux-fbdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] video: kyro: fix incorrect sizes when copying to userspace

On 2013-11-19 21:25, Sasha Levin wrote:
> kyro would copy u32s and specify sizeof(unsigned long) as the size to copy.
> 
> This would copy more data than intended and cause memory corruption and might
> leak kernel memory.
> 
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
>  drivers/video/kyro/fbdev.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/video/kyro/fbdev.c b/drivers/video/kyro/fbdev.c
> index 50c8574..65041e1 100644
> --- a/drivers/video/kyro/fbdev.c
> +++ b/drivers/video/kyro/fbdev.c
> @@ -624,15 +624,15 @@ static int kyrofb_ioctl(struct fb_info *info,
>  			return -EINVAL;
>  		}
>  	case KYRO_IOCTL_UVSTRIDE:
> -		if (copy_to_user(argp, &deviceInfo.ulOverlayUVStride, sizeof(unsigned long)))
> +		if (copy_to_user(argp, &deviceInfo.ulOverlayUVStride, sizeof(deviceInfo.ulOverlayUVStride)))
>  			return -EFAULT;
>  		break;
>  	case KYRO_IOCTL_STRIDE:
> -		if (copy_to_user(argp, &deviceInfo.ulOverlayStride, sizeof(unsigned long)))
> +		if (copy_to_user(argp, &deviceInfo.ulOverlayStride, sizeof(deviceInfo.ulOverlayStride)))
>  			return -EFAULT;
>  		break;
>  	case KYRO_IOCTL_OVERLAY_OFFSET:
> -		if (copy_to_user(argp, &deviceInfo.ulOverlayOffset, sizeof(unsigned long)))
> +		if (copy_to_user(argp, &deviceInfo.ulOverlayOffset, sizeof(deviceInfo.ulOverlayOffset)))
>  			return -EFAULT;
>  		break;
>  	}
> 

Thanks, applied for 3.13 fixes.

 Tomi



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