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  1. Qt
  2. QTBUG-109781

QXmlStreamReader asserts trying to construct XmlStringRef of negative len on external input

    XMLWordPrintable

Details

    • 6326bec46 (dev), 7e9210a83 (6.5), a13f78144 (6.6), fcca4d667 (tqtc/lts-5.15), df51e4095 (tqtc/lts-6.2), 8695e64c6 (6.5.2), bdc8dc513 (dev), c9478b890 (6.5), 70f48ca97 (6.6), 7076e8e9f (tqtc/lts-6.2)
    • Foundation PM Prioritized

    Description

      1. Build the attached project with a developer build of Qt:
        qt-cmake -S /tmp/report/ && cmake --build . --parallel
        
      2. Run the resulting program and pass the attached xml file:
        ./report 54551.xml 
        

        It crashes with a failed assert:

        ASSERT: "len >= 0" in file /home/qtrob/dev/g++-12.2.0/qt-6.4.1-nowebengine-devbld/qtbase/include/QtCore/../../../../../src/qt-6.4.1/qtbase/src/corelib/text/qstringview.h, line 146
        Aborted (core dumped)
        

      gdb give me this backtrace:

      #0  0x00007ffff70a164c in ?? () from /usr/lib/libc.so.6
      #1  0x00007ffff7051958 in raise () from /usr/lib/libc.so.6
      #2  0x00007ffff703b53d in abort () from /usr/lib/libc.so.6
      #3  0x00007ffff76c3c32 in qAbort ()
          at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/global/qglobal.cpp:3369
      #4  0x00007ffff76d49be in qt_message_fatal (context=..., message=...)
          at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/global/qlogging.cpp:1916
      #5  0x00007ffff76d0e82 in QMessageLogger::fatal (this=0x7fffffffda70, 
          msg=0x7ffff7bb5ea8 "ASSERT: \"%s\" in file %s, line %d")
          at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/global/qlogging.cpp:850
      #6  0x00007ffff76c3a66 in qt_assert (assertion=0x7ffff7bb245a "len >= 0", 
          file=0x7ffff7bb2470 "/home/qtrob/dev/g++-12.2.0/qt-6.4.1-nowebengine-devbld/qtbase/include/QtCore/../../../../../src/qt-6.4.1/qtbase/src/corelib/text/qstringview.h", line=146)
          at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/global/qglobal.cpp:3276
      #7  0x00007ffff76bed13 in QStringView::QStringView<QChar, true> (
          this=0x7fffffffdaf0, str=0x55555558375e, len=-2325)
          at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/text/qstringview.h:146
      #8  0x00007ffff7895566 in QtPrivate::XmlStringRef::view (this=0x7fffffffdd20)
          at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/serialization/qxmlstream_p.h:60
      #9  0x00007ffff78954d6 in QtPrivate::XmlStringRef::operator QStringView (
          this=0x7fffffffdd20)
      --Type <RET> for more, q to quit, c to continue without paging--c
         alization/qxmlstream_p.h:57
      #10 0x00007ffff78883e1 in QXmlStreamReaderPrivate::parse (this=0x555555559ff0) at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/serialization/qxmlstreamparser_p.h:789
      #11 0x00007ffff788a83f in QXmlStreamReader::readNext (this=0x7fffffffde58) at /home/qtrob/dev/src/qt-6.4.1/qtbase/src/corelib/serialization/qxmlstream.cpp:561
      #12 0x00005555555552ec in main ()
      

      Google's oss-fuzz found this as issue 54551. They will publish their report on March 24th, the latest.

      Attachments

        1. 54551.xml
          8 kB
        2. CMakeLists.txt
          0.3 kB
        3. main.cpp
          0.3 kB

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              thiago Thiago Macieira
              rlohning Robert Löhning
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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              Dates

                Created:
                Updated:
                Resolved: