ofz#9870 check sequence length before use

Change-Id: I137a9de49c5a73eb5f277dc1519e5e036abba31c
Reviewed-on: https://gerrit.libreoffice.org/58945Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

writerfilter/source/ooxml/OOXMLDocumentImpl.cxx

@@ -635,6 +635,12 @@ void OOXMLDocumentImpl::resolveGlossaryStream(Stream & /*rStream*/)
               OOXMLStream::Pointer_t gStream;
               uno::Sequence< beans::StringPair > aSeq = aSeqs[j];
               //Follows following aSeq[0] is Id, aSeq[1] is Type, aSeq[2] is Target
+              if (aSeq.getLength() < 3)
+              {
+                  SAL_WARN("writerfilter.ooxml", "too short sequence");
+                  continue;
+              }
+
               OUString gId(aSeq[0].Second);
               OUString gType(aSeq[1].Second);
               OUString gTarget(aSeq[2].Second);