Attempt to fix a crash in the H.264 decoder on Windows in the GPU process.

content/common/gpu/media/dxva_video_decode_accelerator_win.cc

Index: content/common/gpu/media/dxva_video_decode_accelerator_win.cc
diff --git a/content/common/gpu/media/dxva_video_decode_accelerator_win.cc b/content/common/gpu/media/dxva_video_decode_accelerator_win.cc
index d356852d2544dbd773e20c8dcb5511c99fa43a10..9f69e4b4b55420e431c4bd3bca81ce194c8f444c 100644
--- a/content/common/gpu/media/dxva_video_decode_accelerator_win.cc
+++ b/content/common/gpu/media/dxva_video_decode_accelerator_win.cc
@@ -236,12 +236,12 @@ static IMFSample* CreateInputSample(const uint8_t* stream,
   CHECK_GE(static_cast<int>(max_length), size);
   memcpy(destination, stream, size);
 
-  hr = buffer->Unlock();
-  RETURN_ON_HR_FAILURE(hr, "Failed to unlock buffer", NULL);
-
   hr = buffer->SetCurrentLength(size);
   RETURN_ON_HR_FAILURE(hr, "Failed to set buffer length", NULL);
 
+  hr = buffer->Unlock();
+  RETURN_ON_HR_FAILURE(hr, "Failed to unlock buffer", NULL);
+
   return sample.Detach();
 }
 
@@ -254,7 +254,9 @@ static IMFSample* CreateSampleFromInputBuffer(
                     "Failed in base::SharedMemory::Map", NULL);
 
   return CreateInputSample(reinterpret_cast<const uint8_t*>(shm.memory()),
-                           bitstream_buffer.size(), stream_size, alignment);
+                           bitstream_buffer.size(),
+                           std::min<int>(bitstream_buffer.size(), stream_size),

[DaleCurtis, 2016/02/04 22:13:18]

seems this should be uint32_t or DWORD, not int? Ditto for the size type on
CreateInputSample.

[ananta, 2016/02/04 22:32:21]

Done.

+                           alignment);
 }
 
 // Helper function to create a COM object instance from a DLL. The alternative