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

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 03c9c3ce44efadcdc641e326fa891cf62568d4c9
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=03c9c3ce44efadcdc641e326fa891cf62568d4c9

Author: Dmitry Timoshkov <dmitry at baikal.ru>
Date:   Mon Dec 10 11:44:12 2012 +0800

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

---

 dlls/windowscodecs/pngformat.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/dlls/windowscodecs/pngformat.c b/dlls/windowscodecs/pngformat.c
index 009532d..051c60c 100644
--- 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;
 }