Review Request 118639: KCMultiDialog: Fix crash when clicking OK

David Edmundson david at davidedmundson.co.uk
Tue Jun 10 20:34:21 UTC 2014


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Is this the cause of https://bugs.kde.org/show_bug.cgi?id=334624 ?

This fix looks sensible to me.

- David Edmundson


On June 10, 2014, 2:43 p.m., Aurélien Gâteau wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/118639/
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> 
> (Updated June 10, 2014, 2:43 p.m.)
> 
> 
> Review request for KDE Frameworks.
> 
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> Repository: kcmutils
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> 
> Description
> -------
> 
> When one closes KCMultiDialog with OK, QDialog::finished() can be emitted before the clicked() signal of the OK button. This causes the following sequence to happen:
> 
> - KCMultiDialogPrivate::_k_dialogClosed
>   * deletes the KCModule
>     - KCModuleProxyPrivate::_k_moduleDestroyed
>       * sets kcm to 0
> 
> - KCMultiDialog::slotOkClicked
>   - KCMultiDialogPrivate::apply
>     - KCModuleProxy::save
>       - KCModuleProxyPrivate::realModule
>         * notices kcm is 0, so recreates it
>         * calls kcm->save()
>           - KWinDesktopConfig::save()
>             * crashes because it expects kcm->load() to have been called
> 
> To avoid this, trigger the cleanup code in closeEvent() rather than when finished() is emitted, as we can be sure closeEvent() is always called *after* the methods connected to the button box signals has executed.
> 
> 
> Diffs
> -----
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>   src/kcmultidialog.h 72e45a5 
>   src/kcmultidialog.cpp 478c25a 
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> Diff: https://git.reviewboard.kde.org/r/118639/diff/
> 
> 
> Testing
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> 
> Configuring virtual desktops does not crash anymore
> 
> 
> Thanks,
> 
> Aurélien Gâteau
> 
>

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