Avoid overflowing sal_Int16 PROP_GRID_LINES

...as seen with Clang's -fsanitize=implicit-signed-integer-truncation during
CppunitTest_sw_ooxmlexport4 when nTextAreaHeight=36920 and m_nGridLinePitch=1:

> writerfilter/source/dmapper/PropertyMap.cxx:1519:38: runtime error: implicit conversion from type 'int' of value 36920 (32-bit, signed) to type 'const sal_Int16' (aka 'const short') changed the value to -28616 (16-bit, signed)
>  #0 in writerfilter::dmapper::SectionPropertyMap::CloseSectionGroup(writerfilter::dmapper::DomainMapper_Impl&) at writerfilter/source/dmapper/PropertyMap.cxx:1519:38
>  #1 in writerfilter::dmapper::DomainMapper::lcl_endSectionGroup() at writerfilter/source/dmapper/DomainMapper.cxx:2881:30
>  #2 in writerfilter::LoggedStream::endSectionGroup() at writerfilter/source/dmapper/LoggedResources.cxx:101:5
>  #3 in writerfilter::ooxml::OOXMLFastContextHandler::endSectionGroup() at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:434:23
>  #4 in writerfilter::ooxml::OOXMLFactory_wml::endAction(writerfilter::ooxml::OOXMLFastContextHandler*) at workdir/CustomTarget/writerfilter/source/ooxml/OOXMLFactory_wml.cxx:7517:19
>  #5 in writerfilter::ooxml::OOXMLFactory::endAction(writerfilter::ooxml::OOXMLFastContextHandler*) at writerfilter/source/ooxml/OOXMLFactory.cxx:199:19
>  #6 in writerfilter::ooxml::OOXMLFastContextHandler::lcl_endFastElement(int) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:195:5
>  #7 in writerfilter::ooxml::OOXMLFastContextHandler::endFastElement(int) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:177:9
>  #8 in (anonymous namespace)::Entity::endElement() at sax/source/fastparser/fastparser.cxx:483:27
>  #9 in sax_fastparser::FastSaxParserImpl::callbackEndElement() at sax/source/fastparser/fastparser.cxx:1274:17
>  #10 in (anonymous namespace)::call_callbackEndElement(void*, unsigned char const*, unsigned char const*, unsigned char const*) at sax/source/fastparser/fastparser.cxx:310:18
>  #11 in xmlParseEndTag2 at workdir/UnpackedTarball/libxml2/parser.c:9680:2
>  #12 in xmlParseTryOrFinish at workdir/UnpackedTarball/libxml2/parser.c:11531:7
>  #13 in xmlParseChunk__internal_alias at workdir/UnpackedTarball/libxml2/parser.c:12244:13
>  #14 in sax_fastparser::FastSaxParserImpl::parse() at sax/source/fastparser/fastparser.cxx:1043:21
>  #15 in sax_fastparser::FastSaxParserImpl::parseStream(com::sun::star::xml::sax::InputSource const&) at sax/source/fastparser/fastparser.cxx:863:9
>  #16 in sax_fastparser::FastSaxParser::parseStream(com::sun::star::xml::sax::InputSource const&) at sax/source/fastparser/fastparser.cxx:1359:13
>  #17 in writerfilter::ooxml::OOXMLDocumentImpl::resolve(writerfilter::Stream&) at writerfilter/source/ooxml/OOXMLDocumentImpl.cxx:504:22
>  #18 in WriterFilter::filter(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at writerfilter/source/filter/WriterFilter.cxx:192:24
>  #19 in SfxObjectShell::ImportFrom(SfxMedium&, com::sun::star::uno::Reference<com::sun::star::text::XTextRange> const&) at sfx2/source/doc/objstor.cxx:2212:34
>  #20 in SfxObjectShell::DoLoad(SfxMedium*) at sfx2/source/doc/objstor.cxx:741:23
>  #21 in SfxBaseModel::load(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at sfx2/source/doc/sfxbasemodel.cxx:1844:36
>  #22 in (anonymous namespace)::SfxFrameLoader_Impl::load(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XFrame> const&) at sfx2/source/view/frmload.cxx:689:28
>  #23 in framework::LoadEnv::impl_loadContent() at framework/source/loadenv/loadenv.cxx:1150:37
>  #24 in framework::LoadEnv::startLoading() at framework/source/loadenv/loadenv.cxx:384:20
>  #25 in framework::LoadEnv::loadComponentFromURL(com::sun::star::uno::Reference<com::sun::star::frame::XComponentLoader> const&, com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext> const&, rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at framework/source/loadenv/loadenv.cxx:170:14
>  #26 in framework::Desktop::loadComponentFromURL(rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at framework/source/services/desktop.cxx:619:12
>  #27 in non-virtual thunk to framework::Desktop::loadComponentFromURL(rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at framework/source/services/desktop.cxx
>  #28 in unotest::MacrosTest::loadFromDesktop(rtl::OUString const&, rtl::OUString const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at unotest/source/cpp/macros_test.cxx:50:60
>  #29 in SwModelTestBase::loadURL(rtl::OUString const&, char const*, char const*) at sw/qa/extras/inc/swmodeltestbase.hxx:761:23
>  #30 in SwModelTestBase::load(rtl::OUString const&, char const*, char const*) at sw/qa/extras/inc/swmodeltestbase.hxx:716:16
>  #31 in SwModelTestBase::executeImportTest(char const*, char const*) at sw/qa/extras/inc/swmodeltestbase.hxx:264:13
>  #32 in testTdf86926_A3::Import() at sw/qa/extras/ooxmlexport/ooxmlexport4.cxx:1140:1
[...]

Change-Id: Idf694b0dda871f1313d36c03764b0199e10d1b25
Reviewed-on: https://gerrit.libreoffice.org/68710
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/writerfilter/source/dmapper/PropertyMap.cxx b/writerfilter/source/dmapper/PropertyMap.cxx
index f1a28bedfc4e..cd74eee85cd3 100644
--- a/writerfilter/source/dmapper/PropertyMap.cxx
+++ b/writerfilter/source/dmapper/PropertyMap.cxx
@@ -1517,9 +1517,9 @@ void SectionPropertyMap::CloseSectionGroup( DomainMapper_Impl& rDM_Impl )
             nGridLinePitch = 1;
         }
 
-        const sal_Int16 nGridLines = nTextAreaHeight / nGridLinePitch;
-        if ( nGridLines >= 0 )
-            Insert( PROP_GRID_LINES, uno::makeAny( nGridLines ) );
+        const sal_Int32 nGridLines = nTextAreaHeight / nGridLinePitch;
+        if ( nGridLines >= 0 && nGridLines <= SAL_MAX_INT16 )
+            Insert( PROP_GRID_LINES, uno::makeAny( sal_Int16(nGridLines) ) );
 
         // PROP_GRID_MODE
         Insert( PROP_GRID_MODE, uno::makeAny( static_cast<sal_Int16> (m_nGridType) ) );