1 files changed, 8 insertions, 2 deletions
diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
index 6082f49..395b8a3 100644
--- a/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
+++ b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
@@ -62,8 +62,14 @@ void QTriangulatingStroker::endCapOrJoinClosed(const qreal *start, const qreal *
         endCap(cur);
     }
     int count = m_vertices.size();
-    m_vertices.add(m_vertices.at(count-2));
-    m_vertices.add(m_vertices.at(count-1));
+
+    // Copy the (x, y) values because QDataBuffer::add(const float& t)
+    // may resize the buffer, which will leave t pointing at the
+    // previous buffer's memory region if we don't copy first.
+    float x = m_vertices.at(count-2);
+    float y = m_vertices.at(count-1);
+    m_vertices.add(x);
+    m_vertices.add(y);
 }