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  1. Qt
  2. QTBUG-15442

Crash when calling QGraphicsProxyWidget::setWidget()

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.12.1
    • 4.6.1, 4.7.1
    • Widgets: GraphicsView
    • None
    • Qt 4.6.1 and Qt 4.7.1 with Windows 7 and MSVC 9.0
    • 794140fb86b470821e3a298a0ba9c8dbbee202b9 (qt/qtbase/5.12)

    Description

      We have found a corner case with QGraphicsProxyWidget where you can cause a crash when setting the proxied widget. I have attached an example program that can easily be converted to a regression test, and a patch to fix the issue.

      The basic repo is the following:

      • Create a parent and child QGraphicsProxyWidget
      • Connect the two items using setParentItem()
      • Call setWidget() on the parent with an initial widget.
      • Later call setWidget() again with a new widget for the parent.

      A crash occurs because a proxied widget has not been assigned to the child QGraphicsProxyWidget yet.

      Attachments

        1. main.cpp
          0.8 kB
        2. qgraphicsproxywidget.patch
          0.7 kB
        For Gerrit Dashboard: QTBUG-15442
        # Subject Branch Project Status CR V
        245885,3 QGraphicsProxyWidget: Don't crash within setWidget() when a child proxy has no assigned widget 5.12 qt/qtbase Status: MERGED +2 0

        Activity

          People

            chehrlic Christian Ehrlicher
            aronbierbaum Aron Bierbaum
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            Dates

              Created:
              Updated:
              Resolved:

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