Avoid division by zero

bb198176684c3d9377e26c04a29ec66deb811949 "MCGR: Make MCGR default for oox
im/export, cleanup" started to cause CppunitTest_chart2_geometry
CPPUNIT_TEST_NAME=Chart2GeometryTest::testTdf128345Legend_CS_TG_axial_import to
fail with the below UBSan failure (even though the relevant code appears to be
even older than that commit).

At least for now, lets silence that by explicitly using +INF in case the divisor
is zero (and the dividend is known non-negative).

> /drawinglayer/source/texture/texture.cxx:246:71: runtime error: division by zero
>     #0 0x7f2e61d80f7f in drawinglayer::texture::GeoTexSvxGradientLinear::appendTransformationsAndColors(std::function<void (basegfx::B2DHomMatrix const&, basegfx::BColor const&)>) /drawinglayer/source/texture/texture.cxx:246:71
>     #1 0x7f2e616e187d in drawinglayer::primitive2d::FillGradientPrimitive2D::generateMatricesAndColors(std::function<void (basegfx::B2DHomMatrix const&, basegfx::BColor const&)>) const /drawinglayer/source/primitive2d/fillgradientprimitive2d.cxx:75:31
>     #2 0x7f2e616e4f4f in drawinglayer::primitive2d::FillGradientPrimitive2D::createFill(drawinglayer::primitive2d::Primitive2DContainer&, bool) const /drawinglayer/source/primitive2d/fillgradientprimitive2d.cxx:172:17
>     #3 0x7f2e616e66ca in drawinglayer::primitive2d::FillGradientPrimitive2D::create2DDecomposition(drawinglayer::primitive2d::Primitive2DContainer&, drawinglayer::geometry::ViewInformation2D const&) const /drawinglayer/source/primitive2d/fillgradientprimitive2d.cxx:269:17
>     #4 0x7f2e76cecd04 in drawinglayer::primitive2d::BufferedDecompositionPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const /drawinglayer/source/primitive2d/BufferedDecompositionPrimitive2D.cxx:36:9
>     #5 0x7f2e619b9278 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:46:24
>     #6 0x7f2e61a38a25 in drawinglayer::processor2d::VclMetafileProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:917:13
>     #7 0x7f2e619b9a5f in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>     #8 0x7f2e61a5cc3e in drawinglayer::processor2d::VclMetafileProcessor2D::processMaskPrimitive2D(drawinglayer::primitive2d::MaskPrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:2139:13
>     #9 0x7f2e61a3734a in drawinglayer::processor2d::VclMetafileProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:833:13
>     #10 0x7f2e619b9a5f in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>     #11 0x7f2e619b952c in drawinglayer::processor2d::BaseProcessor2D::visit(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:56:13
>     #12 0x7f2e76ced03a in drawinglayer::primitive2d::BufferedDecompositionPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const /drawinglayer/source/primitive2d/BufferedDecompositionPrimitive2D.cxx:41:14
>     #13 0x7f2e619b9278 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:46:24
>     #14 0x7f2e61a595e3 in drawinglayer::processor2d::VclMetafileProcessor2D::processPolyPolygonGradientPrimitive2D(drawinglayer::primitive2d::PolyPolygonGradientPrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:2014:9
>     #15 0x7f2e61a36fc0 in drawinglayer::processor2d::VclMetafileProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:821:13
>     #16 0x7f2e619b9a5f in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>     #17 0x7f2e61a2e0da in drawinglayer::processor2d::VclMetafileProcessor2D::impDumpToMetaFile(drawinglayer::primitive2d::Primitive2DContainer const&, GDIMetaFile&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:244:5
>     #18 0x7f2e61a60f4a in drawinglayer::processor2d::VclMetafileProcessor2D::processTransparencePrimitive2D(drawinglayer::primitive2d::TransparencePrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:2292:52
>     #19 0x7f2e61a378cb in drawinglayer::processor2d::VclMetafileProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:851:13
>     #20 0x7f2e619b9a5f in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>     #21 0x7f2e619b952c in drawinglayer::processor2d::BaseProcessor2D::visit(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:56:13
>     #22 0x7f2e76ced03a in drawinglayer::primitive2d::BufferedDecompositionPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const /drawinglayer/source/primitive2d/BufferedDecompositionPrimitive2D.cxx:41:14
>     #23 0x7f2e619b9278 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:46:24
>     #24 0x7f2e61a38a25 in drawinglayer::processor2d::VclMetafileProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:917:13
>     #25 0x7f2e619b9a5f in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>     #26 0x7f2e61a68781 in drawinglayer::processor2d::VclMetafileProcessor2D::processObjectInfoPrimitive2D(drawinglayer::primitive2d::ObjectInfoPrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:965:5
>     #27 0x7f2e61a38916 in drawinglayer::processor2d::VclMetafileProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) /drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx:910:13
>     #28 0x7f2e619b9a5f in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) /drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>     #29 0x7f2df2676731 in sdr::contact::ObjectContactOfPageView::DoProcessDisplay(sdr::contact::DisplayInfo&) /svx/source/sdr/contact/objectcontactofpageview.cxx:277:31
>     #30 0x7f2df26741be in sdr::contact::ObjectContactOfPageView::ProcessDisplay(sdr::contact::DisplayInfo&) /svx/source/sdr/contact/objectcontactofpageview.cxx:117:21
>     #31 0x7f2df291809d in SdrPageWindow::RedrawAll(sdr::contact::ViewObjectContactRedirector*) /svx/source/svdraw/sdrpagewindow.cxx:357:28
>     #32 0x7f2df363584c in SdrPageView::CompleteRedraw(SdrPaintWindow&, vcl::Region const&, sdr::contact::ViewObjectContactRedirector*) /svx/source/svdraw/svdpagv.cxx:239:18
>     #33 0x7f2df36a80b0 in SdrPaintView::DoCompleteRedraw(SdrPaintWindow&, vcl::Region const&, sdr::contact::ViewObjectContactRedirector*) /svx/source/svdraw/svdpntv.cxx:609:21
>     #34 0x7f2df36a7b61 in SdrPaintView::CompleteRedraw(OutputDevice*, vcl::Region const&, sdr::contact::ViewObjectContactRedirector*) /svx/source/svdraw/svdpntv.cxx:522:5
>     #35 0x7f2df3ec0413 in (anonymous namespace)::GraphicExporter::GetGraphic((anonymous namespace)::ExportSettings const&, Graphic&, bool) /svx/source/unodraw/UnoGraphicExporter.cxx:740:24
>     #36 0x7f2df3ec857b in (anonymous namespace)::GraphicExporter::filter(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) /svx/source/unodraw/UnoGraphicExporter.cxx:1037:19
>     #37 0x7f2db53f082a in chart::ChartView::getMetaFile(com::sun::star::uno::Reference<com::sun::star::io::XOutputStream> const&, bool) /chart2/source/view/main/ChartView.cxx:263:20
>     #38 0x7f2db53f1d43 in chart::ChartView::getTransferData(com::sun::star::datatransfer::DataFlavor const&) /chart2/source/view/main/ChartView.cxx:285:11
>     #39 0x7f2db53f28ae in non-virtual thunk to chart::ChartView::getTransferData(com::sun::star::datatransfer::DataFlavor const&) /chart2/source/view/main/ChartView.cxx
>     #40 0x7f2db586547f in chart::ChartModel::getPreferredVisualRepresentation(long) /chart2/source/model/main/ChartModel.cxx:1054:44
>     #41 0x7f2db586779e in non-virtual thunk to chart::ChartModel::getPreferredVisualRepresentation(long) /chart2/source/model/main/ChartModel.cxx
>     #42 0x7f2db8401589 in OCommonEmbeddedObject::getPreferredVisualRepresentation(long) /embeddedobj/source/commonembedding/visobj.cxx:186:48
>     #43 0x7f2e95742555 in comphelper::EmbeddedObjectContainer::GetGraphicReplacementStream(long, com::sun::star::uno::Reference<com::sun::star::embed::XEmbeddedObject> const&, rtl::OUString*) /comphelper/source/container/embeddedobjectcontainer.cxx:1428:54
>     #44 0x7f2e9573f6b4 in comphelper::EmbeddedObjectContainer::StoreAsChildren(bool, bool, bool, com::sun::star::uno::Reference<com::sun::star::embed::XStorage> const&) /comphelper/source/container/embeddedobjectcontainer.cxx:1198:31
>     #45 0x7f2e044c7a1f in SfxObjectShell::SaveAsChildren(SfxMedium&) /sfx2/source/doc/objstor.cxx:3316:38
>     #46 0x7f2e044c6d0c in SfxObjectShell::SaveAs(SfxMedium&) /sfx2/source/doc/objstor.cxx:160:12
>     #47 0x7f2e0c509471 in sd::DrawDocShell::SaveAs(SfxMedium&) /sd/source/ui/docshell/docshel4.cxx:602:33
>     #48 0x7f2e0453a4ec in SfxObjectShell::SaveAsOwnFormat(SfxMedium&) /sfx2/source/doc/objstor.cxx:3256:16
>     #49 0x7f2e0c513d7d in sd::DrawDocShell::SaveAsOwnFormat(SfxMedium&) /sd/source/ui/docshell/docshel4.cxx:924:28
>     #50 0x7f2e044f8b0c in SfxObjectShell::SaveTo_Impl(SfxMedium&, SfxItemSet const*) /sfx2/source/doc/objstor.cxx:1457:23
>     #51 0x7f2e04534ef5 in SfxObjectShell::PreDoSaveAs_Impl(rtl::OUString const&, rtl::OUString const&, SfxItemSet const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) /sfx2/source/doc/objstor.cxx:2993:39
>     #52 0x7f2e0452c40c in SfxObjectShell::CommonSaveAs_Impl(INetURLObject const&, rtl::OUString const&, SfxItemSet&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) /sfx2/source/doc/objstor.cxx:2783:9
>     #53 0x7f2e04486556 in SfxObjectShell::APISaveAs_Impl(std::basic_string_view<char16_t, std::char_traits<char16_t> >, SfxItemSet&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) /sfx2/source/doc/objserv.cxx:319:19
>     #54 0x7f2e046d7afe in SfxBaseModel::impl_store(rtl::OUString const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, bool) /sfx2/source/doc/sfxbasemodel.cxx:3151:42
>     #55 0x7f2e046de8db in SfxBaseModel::storeToURL(rtl::OUString const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) /sfx2/source/doc/sfxbasemodel.cxx:1785:13
>     #56 0x7f2dff75b078 in UnoApiTest::save(rtl::OUString const&, char const*) /test/source/unoapi_test.cxx:174:16
>     #57 0x7f2e63063d61 in Chart2GeometryTest::testTdf128345Legend_CS_TG_axial_import() /chart2/qa/extras/chart2geometry.cxx:322:5

(<>https://ci.libreoffice.org//job/lo_ubsan/2766/)

Change-Id: I72650fba2ee7ba339ec78d24dd690487c31e2600
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/151495
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drawinglayer/source/texture/texture.cxx b/drawinglayer/source/texture/texture.cxx
index 0960ffbbbde3..648359931bd0 100644
--- a/drawinglayer/source/texture/texture.cxx
+++ b/drawinglayer/source/texture/texture.cxx
@@ -20,6 +20,7 @@
 #include <sal/config.h>
 
 #include <algorithm>
+#include <limits>
 
 #include <texture/texture.hxx>
 #include <basegfx/numeric/ftools.hxx>
@@ -243,7 +244,11 @@ namespace drawinglayer::texture
                     // set and add at target
                     aCallback(
                         maGradientInfo.getTextureTransform() * aNew,
-                        interpolate(aCStart, aCEnd, double(innerLoop) / double(nSteps - 1)));
+                        interpolate(
+                            aCStart, aCEnd,
+                            nSteps == 1
+                                ? std::numeric_limits<double>::infinity()
+                                : double(innerLoop) / double(nSteps - 1)));
                 }
             }