[PATCH 4/5] wininet: return the required buffer size from InternetGetLastResponseInfo() when it's too small

[Jacek Caban]

On 6/30/21 8:16 PM, Damjan Jovanovic wrote:
> @@ -1134,8 +1141,14 @@ BOOL WINAPI InternetGetLastResponseInfoW(LPDWORD lpdwError,
>       }
>       if (lpwite)
>       {
> +        if (lpszBuffer == NULL || *lpdwBufferLength < strlen(lpwite->response))
> +        {
> +            *lpdwBufferLength = strlen(lpwite->response);
> +            SetLastError(ERROR_INSUFFICIENT_BUFFER);
> +            return FALSE;
> +        }


Conversion to Unicode may change the length and it looks like we should 
return Unicode length here. You may get the value from 
MultiByteToWideChar, passing NULL output.


Thanks,

Jacek