Fix potential segfault when calling glBufferData with NULL data pointer.

src/libGLESv2/renderer/BufferStorage11.cpp

@@ -160,12 +160,20 @@ void BufferStorage11::setData(const void* data, unsigned int size, unsigned int
             bufferDesc.MiscFlags = 0;
             bufferDesc.StructureByteStride = 0;
 
-            D3D11_SUBRESOURCE_DATA initialData;
-            initialData.pSysMem = data;
-            initialData.SysMemPitch = size;
-            initialData.SysMemSlicePitch = 0;
+            if (data)
+            {
+                D3D11_SUBRESOURCE_DATA initialData;
+                initialData.pSysMem = data;
+                initialData.SysMemPitch = size;
+                initialData.SysMemSlicePitch = 0;
+
+                result = device->CreateBuffer(&bufferDesc, &initialData, &mStagingBuffer);
+            }
+            else
+            {
+                result = device->CreateBuffer(&bufferDesc, NULL, &mStagingBuffer);
+            }
 
-            result = device->CreateBuffer(&bufferDesc, &initialData, &mStagingBuffer);
             if (FAILED(result))
             {
                 return gl::error(GL_OUT_OF_MEMORY);
@@ -173,7 +181,7 @@ void BufferStorage11::setData(const void* data, unsigned int size, unsigned int
 
             mStagingBufferSize = size;
         }
-        else
+        else if (data)
         {
             D3D11_MAPPED_SUBRESOURCE mappedResource;
             result = context->Map(mStagingBuffer, 0, D3D11_MAP_WRITE, 0, &mappedResource);
@@ -211,12 +219,20 @@ void BufferStorage11::setData(const void* data, unsigned int size, unsigned int
                 mBufferSize = 0;
             }
 
-            D3D11_SUBRESOURCE_DATA initialData;
-            initialData.pSysMem = data;
-            initialData.SysMemPitch = size;
-            initialData.SysMemSlicePitch = 0;
+            if (data)
+            {
+                D3D11_SUBRESOURCE_DATA initialData;
+                initialData.pSysMem = data;
+                initialData.SysMemPitch = size;
+                initialData.SysMemSlicePitch = 0;
+
+                result = device->CreateBuffer(&bufferDesc, &initialData, &mBuffer);
+            }
+            else
+            {
+                result = device->CreateBuffer(&bufferDesc, NULL, &mBuffer);
+            }
 
-            result = device->CreateBuffer(&bufferDesc, &initialData, &mBuffer);
             if (FAILED(result))
             {
                 return gl::error(GL_OUT_OF_MEMORY);

src/libGLESv2/renderer/BufferStorage9.cpp

@@ -54,7 +54,10 @@ void BufferStorage9::setData(const void* data, unsigned int size, unsigned int o
     }
 
     mSize = std::max(mSize, offset + size);
-    memcpy(reinterpret_cast<char*>(mMemory) + offset, data, size);
+    if (data)
+    {
+        memcpy(reinterpret_cast<char*>(mMemory) + offset, data, size);
+    }
 }
 
 void BufferStorage9::clear()