From cdfd4b9702ebf053d00321fe5b47ab8a35695866 Mon Sep 17 00:00:00 2001
From: Kim Kulling <kim.kulling@googlemail.com>
Date: Wed, 8 Nov 2017 20:44:53 +0100
Subject: [PATCH] closes https://github.com/assimp/assimp/issues/1315: check in
 exporting against out-of-bounds-access .

---
 code/ObjExporter.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/code/ObjExporter.cpp b/code/ObjExporter.cpp
index fffafa328..6dd68b8f5 100644
--- a/code/ObjExporter.cpp
+++ b/code/ObjExporter.cpp
@@ -258,7 +258,6 @@ void ObjExporter::WriteMaterialFile()
     }
 }
 
-// ------------------------------------------------------------------------------------------------
 void ObjExporter::WriteGeometryFile(bool noMtl) {
     WriteHeader(mOutput);
     if (!noMtl)
@@ -280,8 +279,10 @@ void ObjExporter::WriteGeometryFile(bool noMtl) {
         mOutput << "# " << vp.size() << " vertex positions and colors" << endl;
         size_t colIdx = 0;
         for ( const aiVector3D& v : vp ) {
-            mOutput << "v  " << v.x << " " << v.y << " " << v.z << " " << vc[ colIdx ].r << " " << vc[ colIdx ].g << " " << vc[ colIdx ].b << endl;
-            colIdx++;
+            if ( colIdx < vc.size() ) {
+                mOutput << "v  " << v.x << " " << v.y << " " << v.z << " " << vc[ colIdx ].r << " " << vc[ colIdx ].g << " " << vc[ colIdx ].b << endl;
+            }
+            ++colIdx;
         }
     }
     mOutput << endl;