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

[Tomi Valkeinen]

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.le...@oracle.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

signature.asc
Description: OpenPGP digital signature