https://bugs.kde.org/show_bug.cgi?id=457285
Bug ID: 457285
Summary: KConfigWatcher::config() returns nullptr when built
without DBUS support
Product: frameworks-kconfig
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: matt...@mjdsystems.ca
Reporter: kdu...@redhat.com
CC: kdelibs-b...@kde.org
Target Milestone: ---
As additional KDE applications started to use KConfigWatcher, they started to
crash on my laptop running Gentoo Linux. I was trying to patch them one by one
to prevent the crashes. Then I realized that kconfig was built without dbus
support on my system. After rebuilding kconfig with -DKCONFIG_USE_DBUS, the
crashes went away.
I looked into the source code of KConfigWatcher and discovered that its
constructor initializes d->m_config only if KCONFIG_USE_DBUS is defined:
https://github.com/KDE/kconfig/blob/491f5464/src/core/kconfigwatcher.cpp#L47
Consequently KConfigWatcher::config() may return nullptr, which triggers null
dereference at caller's side, where a non-null value is expected.
STEPS TO REPRODUCE
1. build kconfig without dbus support
OBSERVED RESULT
Applications like plasma or kwin start to crash.
EXPECTED RESULT
No crashes.
SOFTWARE/OS VERSIONS
Linux: 5.15.52-gentoo-x86_64
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.5
ADDITIONAL INFORMATION
Previously reported with backtraces at:
bug #423864 comment #4
bug #453242
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