windowscodecs: GetThumbnail of the PNG decoder should return NULL interface.

03c9c3ce · Dmitry Timoshkov · Alexandre Julliard · 9fbd3bbe · 03c9c3ce
Commit 03c9c3ce authored Dec 10, 2012 by Dmitry Timoshkov Committed by Alexandre Julliard Dec 10, 2012
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pngformat.c dlls/windowscodecs/pngformat.c +4 -0

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--- a/dlls/windowscodecs/pngformat.c
+++ b/dlls/windowscodecs/pngformat.c
@@ -645,6 +645,10 @@ static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
    IWICBitmapSource **ppIThumbnail)
 {
    TRACE("(%p,%p)\n", iface, ppIThumbnail);
+
+    if (!ppIThumbnail) return E_INVALIDARG;
+
+    *ppIThumbnail = NULL;
    return WINCODEC_ERR_CODECNOTHUMBNAIL;
 }