[marble] [Bug 458555] New: GeoDataFolder iterator methods crash

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=458555

            Bug ID: 458555
           Summary: GeoDataFolder iterator methods crash
           Product: marble
           Version: 22.04.3
          Platform: Debian stable
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: marble-bugs at kde.org
          Reporter: magliocca at arlut.utexas.edu
  Target Milestone: ---

SUMMARY
***
With Marble versions 19.08 and 22.04.3, we are experiencing a seg fault when
calling the iterator methods for GeoDataFolder. 

It looks like the d pointer is either becoming corrupted or is getting deleted,
only for the iterator methods. I can call other methods without problems, such
as at() and last(). I ran the same snippet with Marble 16.04 and it runs fine. 
***

STEPS TO REPRODUCE
1. Create an empty Qt+Marble project.
2. Add the following code to main:
    GeoDataFolder *myFolder = new GeoDataFolder();
    myFolder->begin();
3. Compile, build, and run the application.
4. Observe the crash.

OBSERVED RESULT
The application crashes due to a seg fault on the iterator begin command. 

I get a similar seg fault when I try to call end(). The stack trace shows the
following:                                                                      

1 QVector<Marble::GeoDataFeature *>::isDetached qvector.h            113
0x7ffff78f0b36 
2 QVector<Marble::GeoDataFeature *>::detach     qvector.h            399
0x7ffff78f0cfa 
3 QVector<Marble::GeoDataFeature *>::begin      qvector.h            219
0x7ffff78ef4c9 
4 Marble::GeoDataContainer::begin               GeoDataContainer.cpp 349
0x7ffff78ee6fa 
5 main                                          main.cpp             54 
0x55555555b6e4 


EXPECTED RESULT
The application should not crash when calling GeoDataFolder's begin/end
methods.


SOFTWARE/OS VERSIONS
Windows: 10
macOS: 
Linux/KDE Plasma: Debian 10
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 5.15.5

ADDITIONAL INFORMATION
This behavior has been observed on Debian. We have yet to test Windows.

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