Dmitry Timoshkov : windowscodecs: Add a NULL check to GetFrameCount of the PNG decoder.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 5285756f938371457c3577ec9ad03ccacbcb658d
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=5285756f938371457c3577ec9ad03ccacbcb658d

Author: Dmitry Timoshkov <dmitry at baikal.ru>
Date:   Fri Nov 23 11:49:44 2012 +0800

windowscodecs: Add a NULL check to GetFrameCount of the PNG decoder.

---

 dlls/windowscodecs/pngformat.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/dlls/windowscodecs/pngformat.c b/dlls/windowscodecs/pngformat.c
index 4c94489..46a1908 100644
--- a/dlls/windowscodecs/pngformat.c
+++ b/dlls/windowscodecs/pngformat.c
@@ -640,6 +640,8 @@ static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
 static HRESULT WINAPI PngDecoder_GetFrameCount(IWICBitmapDecoder *iface,
     UINT *pCount)
 {
+    if (!pCount) return E_INVALIDARG;
+
     *pCount = 1;
     return S_OK;
 }