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  1. Qt
  2. QTBUG-95134

crash in QAccessibleWidget::window() function with NULL pointer

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P1: Critical P1: Critical
    • None
    • 5.15.2
    • GUI: Accessibility (a11y), Widgets: Widgets and Dialogs
    • None
    • windows 10 professional 21H1
      OS inner version 19043.1083
      Qt 5.15.2 msvc2019_64
    • Windows

      result: 

      QWindow *QAccessibleWidget::window() const
{
    const QWidget *w = widget();
    Q_ASSERT(w);
    QWindow *result = w->windowHandle();
    if (!result) {
        if (const QWidget *nativeParent = w->nativeParentWidget())
            result = nativeParent->windowHandle();
    }
    return result;
}

      this code crash, in release mode assert no effect, but 'w' is NULL .

       

      scene descript:

      When i click a "Qml Button" , i need to create and show  a QWidget dialog.

      QWidget dialog has some QLabel on .ui files, construct Dialog will call setupUI,

      lead to call retranslateUi,  QLabel::setText, then call 

      QAccessible::updateAccessibility with  "NameChanged" QAccessibleEvent,

      then QAccessibleWidget crash.

       

      here is call stack

       

       

       

        1. image-2021-07-13-17-21-47-783.png
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            smd Jan Arve
            jaredtao jared tao
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              Created:
              Updated:

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