Avoid overflow when scaling column width

With -fsanitize=float-cast-overflow, `--convert-to pdf csv/fdo40053-1.csv` with
csv/fdo40053-1.csv as obtained by bin/get-bugzilla-attachments-by-mimetype
(i.e., the attachment at
<https://bugs.documentfoundation.org/show_bug.cgi?id=40053#c0>) fails with

> sc/source/core/data/fillinfo.cxx:445:65: runtime error: 88326.7 is outside the range of representable values of type 'unsigned short'
>  #0 in ScDocument::FillInfo(ScTableInfo&, short, int, short, int, short, double, double, bool, bool, ScMarkData const*) at sc/source/core/data/fillinfo.cxx:445:65 (instdir/program/../program/libsclo.so +0xdb7913d)
>  #1 in ScPrintFunc::PrintArea(short, int, short, int, long, long, bool, bool, bool, bool) at sc/source/ui/view/printfun.cxx:1597:11 (instdir/program/../program/libsclo.so +0x130c0f91)
>  #2 in ScPrintFunc::PrintPage(long, short, int, short, int, bool, ScPreviewLocationData*) at sc/source/ui/view/printfun.cxx:2284:9 (instdir/program/../program/libsclo.so +0x130dbf41)
>  #3 in ScPrintFunc::DoPrint(MultiSelection const&, long, long, bool, ScPreviewLocationData*) at sc/source/ui/view/printfun.cxx:2702:29 (instdir/program/../program/libsclo.so +0x130e8cde)
>  #4 in ScModelObj::render(int, com::sun::star::uno::Any const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at sc/source/ui/unoobj/docuno.cxx:2064:23 (instdir/program/../program/libsclo.so +0x124fea63)
>  #5 in PDFExport::ExportSelection(vcl::PDFWriter&, com::sun::star::uno::Reference<com::sun::star::view::XRenderable> const&, com::sun::star::uno::Any const&, StringRangeEnumerator const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue>&, int) at filter/source/pdf/pdfexport.cxx:227:34 (instdir/program/../program/libpdffilterlo.so +0x2db3b6)
>  #6 in PDFExport::Export(rtl::OUString const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at filter/source/pdf/pdfexport.cxx:939:28 (instdir/program/../program/libpdffilterlo.so +0x2f3751)
>  #7 in PDFFilter::implExport(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at filter/source/pdf/pdffilter.cxx:155:24 (instdir/program/../program/libpdffilterlo.so +0x33d7df)
>  #8 in PDFFilter::filter(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at filter/source/pdf/pdffilter.cxx:216:23 (instdir/program/../program/libpdffilterlo.so +0x33e64f)
>  #9 in SfxObjectShell::ExportTo(SfxMedium&) at sfx2/source/doc/objstor.cxx:2422:25 (instdir/program/libsfxlo.so +0x4a03623)
[...]

where nX = 2, nTab = 0, GetColWidth(0,2) = 50075, and fColScale = 1.76389.
Given csv/fdo40053-1.csv has rather much text in the third column, these values
do not look completely implausible (whatever the column width unit of measure
is, though)---which of course begs the question whether sal_uInt16 is an
appropriate data type here.

But assuming sal_uInt16 is a useful choice, just clamp the calculated width
accordingly.  (Using std::clamp, we can get rid of the following lines that
ensure nThisWidth >= 1.)

Change-Id: Ifa7a666abedc2a2f0a335f4da0ea74961f33870c
Reviewed-on: https://gerrit.libreoffice.org/73267
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/sc/source/core/data/fillinfo.cxx b/sc/source/core/data/fillinfo.cxx
index 63055bdb11b2..abe95752ff68 100644
--- a/sc/source/core/data/fillinfo.cxx
+++ b/sc/source/core/data/fillinfo.cxx
@@ -40,6 +40,8 @@
 #include <cellvalue.hxx>
 #include <mtvcellfunc.hxx>
 
+#include <algorithm>
+#include <limits>
 #include <vector>
 #include <memory>
 
@@ -442,9 +444,7 @@ void ScDocument::FillInfo(
             // TODO: Optimize this loop.
             if (!ColHidden(nX, nTab))
             {
-                sal_uInt16 nThisWidth = static_cast<sal_uInt16>(GetColWidth( nX, nTab ) * fColScale);
-                if (!nThisWidth)
-                    nThisWidth = 1;
+                sal_uInt16 nThisWidth = static_cast<sal_uInt16>(std::clamp(GetColWidth( nX, nTab ) * fColScale, 1.0, double(std::numeric_limits<sal_uInt16>::max())));
 
                 pRowInfo[0].pCellInfo[nArrCol].nWidth = nThisWidth;           //TODO: this should be enough