coverity#1244945 Untrusted value as argument

Change-Id: Ic969ea78a53d0a67591dd476bc01fbdce18c7eab

tools/source/generic/poly2.cxx

@@ -582,7 +582,7 @@ SvStream& ReadPolyPolygon( SvStream& rIStream, tools::PolyPolygon& rPolyPoly )
     const size_t nMaxRecords = rIStream.remainingSize() / nMinRecordSize;
     if (nPolyCount > nMaxRecords)
     {
-        SAL_WARN("vcl.gdi", "Parsing error: " << nMaxRecords <<
+        SAL_WARN("tools", "Parsing error: " << nMaxRecords <<
                  " max possible entries, but " << nPolyCount << " claimed, truncating");
         nPolyCount = nMaxRecords;
     }
@@ -636,6 +636,15 @@ void PolyPolygon::Read( SvStream& rIStream )
     // Read number of polygons
     rIStream.ReadUInt16( nPolyCount );
 
+    const size_t nMinRecordSize = sizeof(sal_uInt16);
+    const size_t nMaxRecords = rIStream.remainingSize() / nMinRecordSize;
+    if (nPolyCount > nMaxRecords)
+    {
+        SAL_WARN("tools", "Parsing error: " << nMaxRecords <<
+                 " max possible entries, but " << nPolyCount << " claimed, truncating");
+        nPolyCount = nMaxRecords;
+    }
+
     if( nPolyCount )
     {
         if ( mpImplPolyPolygon->mnRefCount > 1 )