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  1. Qt
  2. QTBUG-89899

Integer-overflow in QFixed::QFixed

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Details

    • 679750684087cad7a48921c4174a53cdf4855049 (qt/qtbase/dev) 1a07e7899261c044a5325ca21dd20c9c7be3e6ef (qt/qtbase/6.0) 1d86362121f6153b08e5237015a8e23a599b9fc1 (qt/tqtc-qtbase/tqtc/lts-5.15) 781b55b24e190442d7e055a5e54e8acb44104519 (qt/qtbase/5.12)

    Description

      1. Have a build of Qt configured with "-sanitize undefined".
      2. Build the attached project.
      3. Run the resulting program and pass the input file:
        ./report 26034.html
        

        You will see output like:

        /work/qtbase/include/QtGui/6.0.0/QtGui/private/../../../../../../../src/qt/qtbase/src/gui/painting/qfixed_p.h:66:37: runtime error: signed integer overflow: 80000000 * 64 cannot be represented in type 'int'
        

      Found by oss-fuzz as issue 26034.

      Attachments

        1. 26034.html
          0.0 kB
          Robert Löhning
        2. main.cpp
          0.2 kB
          Robert Löhning
        3. report.pro
          0.1 kB
          Robert Löhning

        Activity

          People

            vgt Eirik Aavitsland
            rlohning Robert Löhning
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            Dates

              Created:
              Updated:
              Resolved: