From 011b4027db761fcfe7079ebabc1bb2865e05e889 Mon Sep 17 00:00:00 2001
From: Mark Roszko <mark.roszko@gmail.com>
Date: Sat, 23 Oct 2021 15:46:58 +0000
Subject: [PATCH] Add vertexIndex bounds check

---
 dxflib_qcad/dl_dxf.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dxflib_qcad/dl_dxf.cpp b/dxflib_qcad/dl_dxf.cpp
index a76cf1611f..28e2a96db2 100644
--- a/dxflib_qcad/dl_dxf.cpp
+++ b/dxflib_qcad/dl_dxf.cpp
@@ -1714,7 +1714,7 @@ bool DL_Dxf::handleLWPolylineData( DL_CreationInterface*    /*creationInterface*
                 vertices[4 * vertexIndex + (groupCode / 10 - 1)] = toReal( groupValue );
             }
         }
-        else if( groupCode==42 && vertexIndex<maxVertices )
+        else if( groupCode==42 && vertexIndex<maxVertices && vertexIndex >= 0 )
         {
             vertices[4 * vertexIndex + 3] = toReal( groupValue );
         }