From 61ce7022e2e1218b136328a852e2c938b4287ab8 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Wed, 7 Feb 2018 12:35:40 +0100
Subject: [PATCH] [d3d11] Fix optional write issue in GetData()

---
 src/d3d11/d3d11_context.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/d3d11/d3d11_context.cpp b/src/d3d11/d3d11_context.cpp
index 617c4670..5b81d179 100644
--- a/src/d3d11/d3d11_context.cpp
+++ b/src/d3d11/d3d11_context.cpp
@@ -164,6 +164,11 @@ namespace dxvk {
           void*                             pData,
           UINT                              DataSize,
           UINT                              GetDataFlags) {
+    // Make sure that we can safely write to the memory
+    // location pointed to by pData if it is specified.
+    if (DataSize == 0)
+      pData = nullptr;
+    
     if (pData != nullptr && pAsync->GetDataSize() != DataSize) {
       Logger::err(str::format("D3D11DeviceContext: GetData: Data size mismatch: ", pAsync->GetDataSize(), ",", DataSize));
       return E_INVALIDARG;