Fix crash on zero size but non-NULL bufferData.

src/libGLESv2/renderer/d3d11/BufferStorage11.cpp

@@ -221,7 +221,7 @@ void BufferStorage11::setData(const void* data, size_t size, size_t offset)
     size_t requiredSize = size + offset;
     mSize = std::max(mSize, requiredSize);
 
-    if (data)
+    if (data && size > 0)
     {
         NativeBuffer11 *stagingBuffer = getStagingBuffer();
 

tests/angle_tests/BufferDataTest.cpp

@@ -97,6 +97,21 @@ TEST_F(BufferDataTest, null_data)
     }
 }
 
+TEST_F(BufferDataTest, zero_nonnull_data)
+{
+    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
+    EXPECT_GL_NO_ERROR();
+
+    char *zeroData = new char[0];
+    glBufferData(GL_ARRAY_BUFFER, 0, zeroData, GL_STATIC_DRAW);
+    EXPECT_GL_NO_ERROR();
+
+    glBufferSubData(GL_ARRAY_BUFFER, 0, 0, zeroData);
+    EXPECT_GL_NO_ERROR();
+
+    delete [] zeroData;
+}
+
 TEST_F(BufferDataTest, huge_setdata_should_not_crash)
 {
     glBindBuffer(GL_ARRAY_BUFFER, mBuffer);