[REG 6.1 -> 6.2] Memory leak in QPainterPath

1. Build qtbase and qtsvg configured with "-sanitize address".
2. Use this to build the attached project.
3. Run the resulting program passing the attached input file:

   ./report input.svg
   

   You will see output like:

   =================================================================
   ==62328==ERROR: LeakSanitizer: detected memory leaks
   
   Direct leak of 120 byte(s) in 1 object(s) allocated from:
       #0 0x7f99fb065947 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10f947)
       #1 0x7f99f9c990a5 in QPainterPath::ensureData_helper() (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x8f50a5)
       #2 0x7f99f9c9a4f4 in QPainterPath::setFillRule(Qt::FillRule) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x8f64f4)
       #3 0x7f99efcaa649 in createPathNode(QSvgNode*, QXmlStreamAttributes const&, QSvgHandler*) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0x7f649)
       #4 0x7f99efcded5a in QSvgHandler::startElement(QString const&, QXmlStreamAttributes const&) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xb3d5a)
       #5 0x7f99efcef071 in QSvgHandler::parse() (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xc4071)
       #6 0x7f99efcef74b in QSvgHandler::init() (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xc474b)
       #7 0x7f99efcefb98 in QSvgHandler::QSvgHandler(QIODevice*) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xc4b98)
       #8 0x7f99efd3d1a2 in QSvgTinyDocument::load(QByteArray const&) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0x1121a2)
       #9 0x7f99efd12e37 in QSvgRenderer::load(QByteArray const&) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xe7e37)
       #10 0x7f99f1d7fefc in QSvgIOHandlerPrivate::load(QIODevice*) [clone .part.0] (/tmp/qt-bisect/build/qtbase/plugins/imageformats/libqsvg.so+0x8efc)
       #11 0x7f99f1d807ff in QSvgIOHandler::read(QImage*) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/libqsvg.so+0x97ff)
       #12 0x7f99f971f464 in QImageReader::read(QImage*) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x37b464)
       #13 0x7f99f97228f8 in QImageReader::read() (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x37e8f8)
       #14 0x7f99f96e15a8 in QImage::fromData(unsigned char const*, int, char const*) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x33d5a8)
       #15 0x7f99f96e1932 in QImage::loadFromData(unsigned char const*, int, char const*) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x33d932)
       #16 0x56394fd4c758 in main (/tmp/qt-bisect/test/report+0x1758)
       #17 0x7f99f7eb30b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
   
   Indirect leak of 402 byte(s) in 1 object(s) allocated from:
       #0 0x7f99fb063bc8 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10dbc8)
       #1 0x7f99f8b232fd in QArrayData::allocate(QArrayData**, long long, long long, long long, QArrayData::AllocationOption) (/tmp/qt-bisect/build/qtbase/lib/libQt6Core.so.6+0x8a92fd)
       #2 0x7f99f9b452c0 in QList<QPainterPath::Element>::reserve(long long) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x7a12c0)
       #3 0x7f99f9c99300 in QPainterPath::ensureData_helper() (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x8f5300)
       #4 0x7f99f9c9a4f4 in QPainterPath::setFillRule(Qt::FillRule) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x8f64f4)
       #5 0x7f99efcaa649 in createPathNode(QSvgNode*, QXmlStreamAttributes const&, QSvgHandler*) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0x7f649)
       #6 0x7f99efcded5a in QSvgHandler::startElement(QString const&, QXmlStreamAttributes const&) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xb3d5a)
       #7 0x7f99efcef071 in QSvgHandler::parse() (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xc4071)
       #8 0x7f99efcef74b in QSvgHandler::init() (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xc474b)
       #9 0x7f99efcefb98 in QSvgHandler::QSvgHandler(QIODevice*) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xc4b98)
       #10 0x7f99efd3d1a2 in QSvgTinyDocument::load(QByteArray const&) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0x1121a2)
       #11 0x7f99efd12e37 in QSvgRenderer::load(QByteArray const&) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/../../lib/libQt6Svg.so.6+0xe7e37)
       #12 0x7f99f1d7fefc in QSvgIOHandlerPrivate::load(QIODevice*) [clone .part.0] (/tmp/qt-bisect/build/qtbase/plugins/imageformats/libqsvg.so+0x8efc)
       #13 0x7f99f1d807ff in QSvgIOHandler::read(QImage*) (/tmp/qt-bisect/build/qtbase/plugins/imageformats/libqsvg.so+0x97ff)
       #14 0x7f99f971f464 in QImageReader::read(QImage*) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x37b464)
       #15 0x7f99f97228f8 in QImageReader::read() (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x37e8f8)
       #16 0x7f99f96e15a8 in QImage::fromData(unsigned char const*, int, char const*) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x33d5a8)
       #17 0x7f99f96e1932 in QImage::loadFromData(unsigned char const*, int, char const*) (/tmp/qt-bisect/build/qtbase/lib/libQt6Gui.so.6+0x33d932)
       #18 0x56394fd4c758 in main (/tmp/qt-bisect/test/report+0x1758)
       #19 0x7f99f7eb30b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
   
   SUMMARY: AddressSanitizer: 522 byte(s) leaked in 2 allocation(s).
   

Google tracks this as oss-fuzz issue 31735. They will publish the details on June 3rd.