Bug 186628

Summary:	[PATCH] Plasma segfaults at KDE startup in PanelView::updatePanelGeometry
Product:	[Plasma] plasma4	Reporter:	Christopher January <chris>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED DUPLICATE
Severity:	crash	CC:	kde
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed In:
Attachments:	Backtrace showing null-pointer dereference in PanelView::updatePanelGeometry. Patch against KDE 4.2.1

Description Christopher January 2009-03-09 10:29:47 UTC

Version:            (using KDE 4.2.1)
Compiler:          gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) 
OS:                Linux
Installed from:    Fedora RPMs

I installed KDE 4.2.1-3.FC10 from the kde-redhat kde-testing repository and plasma segfaults when KDE is starting up.

I tracked this down to what appears to be a bug in panelview.cpp:

PanelView::PanelView calls:

pinchContainment(screenRect);    (panelview.cpp:243)

pinchContainment calls QGraphicsWidget::resize which causes
Plasma::Containment::resizeEvent to fire. This in turn calls
Plasma::Applet::itemChange which indirectly calls
PanelView::updatePanelGeometry.

PanelView::updatePanelGeometry references m_strutsTimer
(panelview.cpp:543). But m_strutsTimer is initialised *after* the call
to pinchContainment in PanelView::PanelView.

The attached patch fixes the segfault. I've also attached a backtrace with debugging symbols.

Comment 1 Christopher January 2009-03-09 10:31:06 UTC

Created attachment 31941 [details]
Backtrace showing null-pointer dereference in PanelView::updatePanelGeometry.

Comment 2 Christopher January 2009-03-09 10:31:54 UTC

Created attachment 31942 [details]
Patch against KDE 4.2.1

Comment 3 Nicolas L. 2009-03-09 12:32:04 UTC


*** This bug has been marked as a duplicate of bug 185736 ***