urlmon: Fix call to ReadFile.

The BytesRead parameter passed to ReadFile may never be NULL.

urlmon: Fix call to ReadFile.
38bfd5e6 · Thomas Weidenmueller · Alexandre Julliard · 648cc6f4 · 38bfd5e6
Commit 38bfd5e6 authored Dec 09, 2005 by Thomas Weidenmueller Committed by Alexandre Julliard Dec 09, 2005
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umstream.c dlls/urlmon/umstream.c +2 -1

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--- a/dlls/urlmon/umstream.c
+++ b/dlls/urlmon/umstream.c
@@ -225,6 +225,7 @@ static HRESULT WINAPI IStream_fnRead (IStream * iface,
                                      ULONG cb,
                                      ULONG* pcbRead)
 {
+    DWORD dwBytesRead;
    IUMCacheStream *This = (IUMCacheStream *)iface;

    TRACE("(%p)->(%p,0x%08lx,%p)\n",This, pv, cb, pcbRead);
@@ -232,7 +233,7 @@ static HRESULT WINAPI IStream_fnRead (IStream * iface,
    if ( !pv )
       return STG_E_INVALIDPOINTER;

-    if ( ! ReadFile( This->handle, pv, cb, pcbRead, NULL ) )
+    if ( ! ReadFile( This->handle, pv, cb, (pcbRead ? pcbRead : &dwBytesRead), NULL ) )
       return S_FALSE;

    if (!*pcbRead)