[Bug 161684] New: KCompletion crashes at pressing Ctrl+Down in KHistoryCombo (Konqueror / Krusader URL requester)

[Karai Csaba]

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http://bugs.kde.org/show_bug.cgi?id=161684         
           Summary: KCompletion crashes at pressing Ctrl+Down in
                    KHistoryCombo (Konqueror / Krusader URL requester)
           Product: kde
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs kde org
        ReportedBy: cskarai freemail hu


Version:            (using Devel)
Installed from:    Compiled sources
OS:                Linux

KCompletion crashes at pressing Ctrl+Down in KHistoryCombo (Konqueror / Krusader URL requester)

#0  0xb76dd782 in KCompletion::nextMatch () from /usr/lib/libkdeui.so.5
#1  0xb7732db9 in KLineEdit::rotateText () from /usr/lib/libkdeui.so.5
#2  0xb7738442 in KLineEdit::keyPressEvent () from /usr/lib/libkdeui.so.5
#3  0xb65a90a6 in QWidget::event () from /usr/lib/libQtGui.so.4
#4  0xb68a5da7 in QLineEdit::event () from /usr/lib/libQtGui.so.4
#5  0xb773792f in KLineEdit::event () from /usr/lib/libkdeui.so.5
#6  0xb68686ff in QComboBox::keyPressEvent () from /usr/lib/libQtGui.so.4
#7  0xb7729f72 in KHistoryComboBox::keyPressEvent () from /usr/lib/libkdeui.so.5
#8  0xb65a90a6 in QWidget::event () from /usr/lib/libQtGui.so.4
#9  0xb686728f in QComboBox::event () from /usr/lib/libQtGui.so.4
#10 0xb6556f0c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#11 0xb655e473 in QApplication::notify () from /usr/lib/libQtGui.so.4
#12 0xb768042d in KApplication::notify () from /usr/lib/libkdeui.so.5
#13 0xb7060c31 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4

==17570==
==17570== Invalid read of size 4
==17570==    at 0x495877E: KCompletion::nextMatch() (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x49ADDB8: KLineEdit::rotateText(KCompletionBase::KeyBindingType) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x49B3441: KLineEdit::keyPressEvent(QKeyEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x55130A5: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x580FDA6: QLineEdit::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x49B292E: KLineEdit::event(QEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x57D26FE: QComboBox::keyPressEvent(QKeyEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x49A4F71: KHistoryComboBox::keyPressEvent(QKeyEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x55130A5: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x57D128E: QComboBox::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x54C0F0B: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x54C8472: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==  Address 0x6C89B3C is 0 bytes after a block of size 20 alloc'd
==17570==    at 0x4022825: malloc (in /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so)
==17570==    by 0x4E779AC: qMalloc(unsigned) (in /usr/lib/libQtCore.so.4.4.0)
==17570==    by 0x4E9D3F0: QListData::detach2() (in /usr/lib/libQtCore.so.4.4.0)
==17570==    by 0x482B626: (within /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x49588F7: KCompletion::nextMatch() (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x49ADDB8: KLineEdit::rotateText(KCompletionBase::KeyBindingType) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x49B3441: KLineEdit::keyPressEvent(QKeyEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x55130A5: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x580FDA6: QLineEdit::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x49B292E: KLineEdit::event(QEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x57D26FE: QComboBox::keyPressEvent(QKeyEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x49A4F71: KHistoryComboBox::keyPressEvent(QKeyEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==
==17570== Invalid read of size 4
==17570==    at 0x4958782: KCompletion::nextMatch() (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x49ADDB8: KLineEdit::rotateText(KCompletionBase::KeyBindingType) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x49B3441: KLineEdit::keyPressEvent(QKeyEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x55130A5: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x580FDA6: QLineEdit::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x49B292E: KLineEdit::event(QEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x57D26FE: QComboBox::keyPressEvent(QKeyEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x49A4F71: KHistoryComboBox::keyPressEvent(QKeyEvent*) (in /usr/lib/libkdeui.so.5.1.0)
==17570==    by 0x55130A5: QWidget::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x57D128E: QComboBox::event(QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x54C0F0B: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==    by 0x54C8472: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.4.0)
==17570==  Address 0x0 is not stack'd, malloc'd or (recently) free'd