ole32: Return an error from CoUnmarshalInterface if pStream is NULL or if ppv is NULL.

[Robert Shearman]

---
  dlls/ole32/marshal.c |    3 +++
  1 files changed, 3 insertions(+), 0 deletions(-)
-------------- next part --------------
diff --git a/dlls/ole32/marshal.c b/dlls/ole32/marshal.c
index 4294cb5..3708f50 100644
--- a/dlls/ole32/marshal.c
+++ b/dlls/ole32/marshal.c
@@ -1659,6 +1659,9 @@ HRESULT WINAPI CoUnmarshalInterface(IStr
 
     TRACE("(%p, %s, %p)\n", pStream, debugstr_guid(riid), ppv);
 
+    if (!pStream || !ppv)
+        return E_INVALIDARG;
+
     hr = get_unmarshaler_from_stream(pStream, &pMarshal, &iid);
     if (hr != S_OK)
         return hr;