| Summary: | GeoDataFolder iterator methods crash | ||
|---|---|---|---|
| Product: | [Applications] marble | Reporter: | magliocca |
| Component: | general | Assignee: | marble-bugs |
| Status: | REPORTED --- | ||
| Severity: | crash | CC: | morrand276 |
| Priority: | NOR | ||
| Version: | 22.04.3 | ||
| Target Milestone: | --- | ||
| Platform: | Debian stable | ||
| OS: | Microsoft Windows | ||
| See Also: | https://bugs.kde.org/show_bug.cgi?id=471339 | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
I can confirm the same problem is occurring on FreeBSD 12.3 on Marble 22.08.1 (FreeBSD port version 22.08.1_1), with Qt version 5.15.5p165, Plasma 5.24.6_1. It's actually showing up in two different ways for me. If the GeoDataFolder is created in a different function, then within begin(), *this is null, and the attempt to set the d pointer segfaults, apparently because it's trying to access memory at this+0x18 or something like that. If it's created within the same function, then *this is some absurd value like 0x7fffffffe598 and the attempt to set d fails with a bus error. These seem to just be different expressions of the same problem. I too can access at(), first(), and other methods within GeoDataFolder without any trouble, and they seem to return sensible results. This problem seems to affect just the methods that return a QVector<GeoDataFeature*>::Iterator, which are begin() and end(). |
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.