https://bugs.kde.org/show_bug.cgi?id=525207
Bug ID: 525207
Summary: Crash in wallpaper() D-Bus API: cannot add a null
QDBusVariant
Classification: Plasma
Product: plasmashell
Version First 6.7.4
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
Querying org.kde.PlasmaShell.wallpaper() via D-Bus while the wallpaper settings
dialog is open and switching wallpaper plugins crashes plasmashell with
SIGABRT.
STEPS TO REPRODUCE
1. Run a script or tool that queries wallpaper over D-Bus (e.g. qdbus
org.kde.plasmashell /PlasmaShell org.kde.PlasmaShell.wallpaper 0)
2. Open Desktop and Wallpaper settings
3. Change wallpaper plugin (e.g. Picture of the Day to Image)
OBSERVED RESULT
plasmashell aborts immediately (SIGABRT).
>From journalctl:
plasmashell[PID]: QDBusMarshaller: cannot add a null QDBusVariant
plasmashell[PID]: process PID: arguments to dbus_message_iter_close_container()
were incorrect
systemd[1174]: plasma-plasmashell.service: Main process exited, code=killed,
status=6/ABRT
>From coredumpctl gdb:
#0 __pthread_kill_implementation (threadid=..., signo=6) at pthread_kill.c:44
#1 raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:27
#2 abort () at abort.c:81
#3 qt_message_fatal (...) at global/qlogging.cpp
#4 QDBusMarshaller::appendVariant (customVariant=...) at
/usr/src/debug/qt6-base/src/dbus/qdbusmarshaller.cpp:580
#5 QDBusMarshaller::addBasicType (...)
#6 dbus_message_iter_close_container (...) at libdbus-1.so.3
EXPECTED RESULT
D-Bus method returns the available properties or an empty map without crashing.
ADDITIONAL INFORMATION
In plasma-workspace/shell/shellcorona.cpp (ShellCorona::wallpaper):
- config is not null-checked before accessing keys.
- config->value(itemName) can return an invalid QVariant during plugin
transitions.
Passing an invalid QVariant to QVariantMap causes QDBusMarshaller to fail when
serializing, which triggers the libdbus assertion abort.
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