1 files changed, 4 insertions, 2 deletions
diff --git a/src/widgets/dialogs/qcolordialog.cpp b/src/widgets/dialogs/qcolordialog.cpp
index 274785660b..9e7da2835b 100644
--- a/src/widgets/dialogs/qcolordialog.cpp
+++ b/src/widgets/dialogs/qcolordialog.cpp
@@ -1868,12 +1868,14 @@ void QColorDialogPrivate::retranslateStrings()
 
 bool QColorDialogPrivate::canBeNativeDialog() const
 {
-    Q_Q(const QColorDialog);
+    // Don't use Q_Q here! This function is called from ~QDialog,
+    // so Q_Q calling q_func() invokes undefined behavior (invalid cast in q_func()).
+    const QDialog * const q = static_cast<const QDialog*>(q_ptr);
     if (nativeDialogInUse)
         return true;
     if (QCoreApplication::testAttribute(Qt::AA_DontUseNativeDialogs)
         || q->testAttribute(Qt::WA_DontShowOnScreen)
-        || (q->options() & QColorDialog::DontUseNativeDialog)) {
+        || (options->options() & QColorDialog::DontUseNativeDialog)) {
         return false;
     }