[patch] vmwgfx: return an -EFAULT if copy_to_user() fails

[Thomas Hellstrom]

On 11/12/2012 12:07 PM, Dan Carpenter wrote:
> copy_to_user() returns the number of bytes remaining to be copied, but
> we want to return a negative error code here.  I fixed a couple of these
> last year, but I missed this one.
>
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> ---
> I think there were only three copy_to/from_user() functions in this
> file and they're all fixed now.
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
> index b07ca2e..7290811 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
> @@ -110,6 +110,8 @@ int vmw_get_cap_3d_ioctl(struct drm_device *dev, void *data,
>   	memcpy_fromio(bounce, &fifo_mem[SVGA_FIFO_3D_CAPS], size);
>   
>   	ret = copy_to_user(buffer, bounce, size);
> +	if (ret)
> +		ret = -EFAULT;
>   	vfree(bounce);
>   
>   	if (unlikely(ret != 0))
Reviewed-by: Thomas Hellstrom <thellstrom at vmware.com>