CID#736198 out of bounds

Change-Id: Idb564e9e2d3d8a8d23ff2c3065c8368c558e3069

sw/source/core/txtnode/ndtxt.cxx

@@ -2778,7 +2778,15 @@ sal_Bool SwTxtNode::GetFirstLineOfsWithNum( short& rFLOffset ) const
     {
         if ( IsCountedInList() )
         {
-            const SwNumFmt& rFmt = pRule->Get(static_cast<sal_uInt16>(GetActualListLevel()));
+            int nLevel = GetActualListLevel();
+
+            if (nLevel < 0)
+                nLevel = 0;
+
+            if (nLevel >= MAXLEVEL)
+                nLevel = MAXLEVEL - 1;
+
+            const SwNumFmt& rFmt = pRule->Get(static_cast<sal_uInt16>(nLevel));
             if ( rFmt.GetPositionAndSpaceMode() == SvxNumberFormat::LABEL_WIDTH_AND_POSITION )
             {
                 rFLOffset = pRule->Get( static_cast<sal_uInt16>(GetActualListLevel() )).GetFirstLineOffset();