Review Request 122393: Fix dangling pointer and possible memory leak in knotifications

[Xuetian Weng]

> On Feb. 2, 2015, 9:05 p.m., Martin Klapetek wrote:
> > src/notifybypopup.cpp, lines 485-495
> > <https://git.reviewboard.kde.org/r/122393/diff/2/?file=346479#file346479line485>
> >
> >     Can you explain this change in a bit more detail?

Well.. I just randomly notice this. line 470 might return and watcher won't be deleted in that case.


- Xuetian


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On Feb. 2, 2015, 8:59 p.m., Xuetian Weng wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/122393/
> -----------------------------------------------------------
> 
> (Updated Feb. 2, 2015, 8:59 p.m.)
> 
> 
> Review request for KDE Frameworks and Martin Klapetek.
> 
> 
> Bugs: 342752
>     https://bugs.kde.org/show_bug.cgi?id=342752
> 
> 
> Repository: knotifications
> 
> 
> Description
> -------
> 
> - Follow code would crash with current code, because notificationQueue may contain dangling pointer to KNotification.
> 
>     #include <QApplication>
>     #include <KNotification>
>     
>     int main(int argc, char* argv[]) {
>         QApplication app(argc,argv);
> 
>         do {
>             KNotification a("NewMessage");
>             a.setComponentName("kwrited"); // just a random component for test
>             a.sendEvent();
>         } while(0);
> 
>         app.exec();
> 
>         return 0;
>     }
> 
> This is fixed by remove item from queue in ::close.
> 
> - 342752 might happen because galagoNotifications may contain dangling pointer.
> This is fixed by using QPointer in galagoNotifications (instead of in ::close, because it will initiate a dbus call and others may be still willing to wait for finished signal).
> 
> If KNotification is already deleted, don't call other related functions on this KNotification.
> 
> - watcher is safer to call deleteLater on watcher first.
> 
> 
> Diffs
> -----
> 
>   src/notifybypopup.cpp 95937fc 
> 
> Diff: https://git.reviewboard.kde.org/r/122393/diff/
> 
> 
> Testing
> -------
> 
> Above code doesn't crash anymore.
> 
> 
> Thanks,
> 
> Xuetian Weng
> 
>

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