qt_mainwindow_layout(mainWindow) returns the pointer to a stale object, if the layout has already been deleted. Most users of qt_mainwindow_layout() assert the returned pointer, or handle nullptr explicitly. If the mainwindow layout has already been deleted, they will still access it. While this has not lead to (known) issues yet, a UAF exception is thrown in an ASAN build. => Use a QPointer instead of a bare pointer. => Add missing nullptr check in QDockWidgetPrivate::endDrag() Pick-to: 6.5 Change-Id: I3484b53e0e2213b82085ceed3ffa66913947189f Reviewed-by: David Faure <david.faure@kdab.com> (cherry picked from commit 1914f62c317075e30489701fd2efc87f3aa9367a) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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