[Bug 170043] New: [PATCH] KConfigGroupPrivate::expandString causes kdeinit crash with Fedora configuration

[Kevin Kofler]

http://bugs.kde.org/show_bug.cgi?id=170043

           Summary: [PATCH] KConfigGroupPrivate::expandString causes kdeinit
                    crash with Fedora configuration
           Product: kdelibs
           Version: unspecified
          Platform: Fedora RPMs
        OS/Version: Linux
            Status: NEW
          Severity: crash
          Priority: NOR
         Component: kdecore
        AssignedTo: kdelibs-bugs at kde.org
        ReportedBy: kevin.kofler at chello.at


Version:           >= 4.0.98 (using KDE 4.1.1)
OS:                Linux
Installed from:    Fedora RPMs

Since revision 829259, i.e. in KDE >= 4.0.98, kinit.cpp uses KConfig without a
KComponentData to read the "Documents" path, because initializing a
KComponentData at that place was breaking kioslave translations.

Unfortunately, if the setting for Documents contains a shell command, as it
does in the Fedora configuration:
Documents[$e]=$(xdg-user-dir DOCUMENTS)
KConfigGroupPrivate::expandString gets called and tries to unconditionally
access the KComponentData which has not been initialized yet. This causes
either an assertion failure or a NULL pointer dereference, depending on whether
NDEBUG is defined or not.

See: https://bugzilla.redhat.com/show_bug.cgi?id=455130 for the Fedora bug
report.

The change triggering the regression (plus followup fix):
http://websvn.kde.org/?view=rev&revision=829259
http://websvn.kde.org/?view=rev&revision=829264
At first, we "fixed" this in Fedora by reverting those changes, but we have a
proper fix now, which I'm about to attach.


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