[2/5] strmbase: Add validation checks when updating source rectangle.

[Andrew Eikum]

On Sun, Nov 20, 2016 at 03:33:22PM +0900, Akihiro Sagawa wrote:
> @@ -53,6 +53,26 @@ HRESULT WINAPI BaseControlVideo_Destroy(BaseControlVideo *pControlVideo)
>      return BaseDispatch_Destroy(&pControlVideo->baseDispatch);
>  }
>  
> +static HRESULT BaseControlVideoImpl_CheckSourceRect(BaseControlVideo *This, RECT *pSourceRect)
> +{
> +    LONG VideoWidth, VideoHeight;
> +    HRESULT hr;
> +
> +    if (pSourceRect->top < 0 || pSourceRect->left < 0 ||
> +        pSourceRect->top >= pSourceRect->bottom ||
> +        pSourceRect->left >= pSourceRect->right)
> +        return E_INVALIDARG;

I'm not opposed to spelling it out, but you could use IsRectEmpty()
here instead.

> +
> +    hr = BaseControlVideoImpl_GetVideoSize((IBasicVideo *)This, &VideoWidth, &VideoHeight);
> +    if (FAILED(hr))
> +        return hr;
> +
> +    if (pSourceRect->bottom > VideoHeight || pSourceRect->right > VideoWidth)
> +        return E_INVALIDARG;
> +

Shouldn't these use (bottom - top) and (right - left)?

Andrew