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  1. Qt
  2. QTBUG-94068

Undefined behavior

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    • aa7a10ce8b062bad4df40afc63d2fea34744a2fb b42953cc207af942f3f2e9948fb83e605fdde000

    Description

      1. Configure Qt with "-sanitize undefined".
      2. Build Qt.
      3. Build the attached project using this build of Qt:
        #include <QCoreApplication>
        #include <QJSEngine>
        
        int main(int argc, char *argv[]) {
            QCoreApplication a(argc, argv);
            QJSEngine().evaluate("function a(){a(a&a+a)}a()");
            return 0;
        }
        
      4. Run the resulting program.
        You will see output like:
        qtbase/include/QtQml/../../../../../src/qt-dev-base_declarative_svg-05.20/qtdeclarative/src/qml/common/qjsnumbercoercion.h:52:34: runtime error: nan is outside the range of representable values of type 'int'
        SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior qtbase/include/QtQml/../../../../../src/qt-dev-base_declarative_svg-05.20/qtdeclarative/src/qml/common/qjsnumbercoercion.h:52:34 in 
        /home/qtrob/dev/src/qt-dev-base_declarative_svg-05.20/qtdeclarative/src/qml/jit/qv4baselineassembler.cpp:310:13: runtime error: load of value 4294967295, which is not a valid value for type 'JSC::MacroAssembler<JSC::MacroAssemblerX86_64>::RegisterID' (aka 'JSC::X86Registers::RegisterID')
        SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/qtrob/dev/src/qt-dev-base_declarative_svg-05.20/qtdeclarative/src/qml/jit/qv4baselineassembler.cpp:310:13 in 
        qtbase/include/QtQml/../../../../../src/qt-dev-base_declarative_svg-05.20/qtdeclarative/src/qml/common/qjsnumbercoercion.h:52:34: runtime error: nan is outside the range of representable values of type 'int'
        SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior qtbase/include/QtQml/../../../../../src/qt-dev-base_declarative_svg-05.20/qtdeclarative/src/qml/common/qjsnumbercoercion.h:52:34 in
        

      Attachments

        1. main.cpp
          0.2 kB
        2. report.pro
          0.1 kB

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              ulherman Ulf Hermann
              rlohning Robert Löhning
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              Dates

                Created:
                Updated:
                Resolved: