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  1. Qt
  2. QTBUG-13237

Crash in QWidgetPrivate::unregisterOleDnd() when dropTarget->Release() decrements reference count to zero

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P2: Important P2: Important
    • 4.8.6
    • 4.6.3, 4.7.4, 4.8.0
    • Widgets: Widgets and Dialogs
    • None
    • Windows XP, Windows Vista, Windows 7
    • 871c2fbc5192836cc2918a760aec4d4c680fd8c0

      This is a duplicate of QTBUG-7801, but that bug was closed due to lack of activity.

      A crash will occur in QWidgetPrivate::unregisterOleDnd (\src\gui\kernel\qwidget_win.cpp) when the function attempts to call CoLockObjectExternal(dropTarget, false, true) if the dropTarget object's reference count was decremented to zero by the dropTarget->Release() call at the beginning of the function.

      I haven't been able to create a small project that can repro this issue, but I have attached a patch which fixes the problem for our project.

        1. patch.txt
          0.8 kB
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            andysh Andy Shaw
            hendo Neil Henderson
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              Created:
              Updated:
              Resolved:

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