Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.
Bug 155651 - segmentation fault using qt's QPtrList at() method
Summary: segmentation fault using qt's QPtrList at() method
Alias: None
Product: Fedora
Classification: Fedora
Component: qt
Version: rawhide
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Ngo Than
QA Contact: Ben Levenson
Depends On:
TreeView+ depends on / blocked
Reported: 2005-04-22 08:50 UTC by Adrian Reber
Modified: 2007-11-30 22:11 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2005-04-28 10:39:27 UTC

Attachments (Terms of Use)

Description Adrian Reber 2005-04-22 08:50:51 UTC
Following code crashes with a segmentation fault:

#include <qstring.h>
#include <qptrlist.h>
class track_info {

    QString songname;

int main() {
        QPtrList < track_info > trk;
        QString test;
        trk.append(new track_info());
        QString *haha = new QString("haha");>songname = haha->utf8();
        return 0;

I am using following command to compile it:
gcc  -I/usr/lib/qt-3.3/include -lqt-mt -L/usr/lib/qt-3.3/lib

And gdb says:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208174912 (LWP 13456)]
0x07560177 in QString::setUnicode () from /usr/lib/qt-3.3/lib/

I think that this is a bug because the documentation
( says:

"Returns a pointer to the item at position index in the list, or 0 if the index
is out of range."

I have tested it with qt-3.3.4-0.fc3.0, qt-devel-3.3.3-8 and qt-3.3.4-11

Comment 1 Ngo Than 2005-04-28 10:39:27 UTC
Hm, it seems your test case is broken, the index is out of range in this case
and get a NULL pointer here! it's why it crashes.

Comment 2 Adrian Reber 2005-04-28 11:19:49 UTC
Okay, then I have maybe misunderstood the documentation:

"Returns a pointer to the item at position index in the list, or 0 if the index
is out of range."

I thought it means I get the element at position 0 but maybe it means I get
NULL. If that's the case then it is my fault.

Note You need to log in before you can comment on or make changes to this bug.