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List:       kde-bugs-dist
Subject:    [frameworks-ktexteditor] [Bug 386394] New: Crash in auto-indenter
From:       Matthew Woehlke <bugzilla_noreply () kde ! org>
Date:       2017-10-31 18:16:14
Message-ID: bug-386394-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=386394

            Bug ID: 386394
           Summary: Crash in auto-indenter
           Product: frameworks-ktexteditor
           Version: 5.38.0
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kwrite-bugs-null@kde.org
          Reporter: mwoehlke.floss@gmail.com
  Target Milestone: ---

I'm experiencing a reproducible crash when trying to edit a Javascript file.
GDB and the bug reporting wizard are having problems generating a stack trace.
Valgrind reports:

    ==4284== Invalid read of size 8
    ==4284==    at 0x35816C79: ???
    ==4284==    by 0xA387305: ??? (in /usr/lib64/libQt5Qml.so.5.7.1)
    ==4284==    by 0xA3EF7D6:
QV4::Runtime::callActivationProperty(QV4::ExecutionEngine*, int,
QV4::CallData*) (in /usr/lib64/libQt5Qml.so.5.7.1)
    ==4284==    by 0x2F6CA9F1: ???
    ==4284==    by 0xA387305: ??? (in /usr/lib64/libQt5Qml.so.5.7.1)
    ==4284==    by 0xA3EF7D6:
QV4::Runtime::callActivationProperty(QV4::ExecutionEngine*, int,
QV4::CallData*) (in /usr/lib64/libQt5Qml.so.5.7.1)
    ==4284==    by 0x2F6C9DA0: ???
    ==4284==    by 0xA387305: ??? (in /usr/lib64/libQt5Qml.so.5.7.1)
    ==4284==    by 0xA2ED235: QJSValue::call(QList<QJSValue> const&) (in
/usr/lib64/libQt5Qml.so.5.7.1)
    ==4284==    by 0x4F67E2D:
KateIndentScript::indent(KTextEditor::ViewPrivate*, KTextEditor::Cursor const&,
QChar, int) (kateindentscript.cpp:75)
    ==4284==    by 0x50258BD:
KateAutoIndent::scriptIndent(KTextEditor::ViewPrivate*, KTextEditor::Cursor
const&, QChar) (kateautoindent.cpp:278)
    ==4284==    by 0x5026935:
KateAutoIndent::userTypedChar(KTextEditor::ViewPrivate*, KTextEditor::Cursor
const&, QChar) (kateautoindent.cpp:453)
    ==4284==  Address 0xb5bd04d8 is not stack'd, malloc'd or (recently) free'd

To reproduce:

- Open
https://raw.githubusercontent.com/Kitware/vaui/84ba21ecce5fb64388b1510b50c8cbb8c9bda3e1/web_external/Viewer/ImageViewerWidgetWrapper/VauiGeoJSImageViewer.js
                
- Move the caret to the end of line 36 (`var pendingNext = false;`)
- Press enter

Curiously, if I paste the file contents into an empty document and set HL to
'javascript', no crash...

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