From c056c7db40ca458f0e67b013ee344895e1461ace Mon Sep 17 00:00:00 2001
From: mkazhdan <misha@cs.jhu.edu>
Date: Thu, 12 Nov 2015 22:30:11 -0500
Subject: [PATCH] Memory Access Out of Bounds Fix

Added a necessary check to avoid out-of-bounds memory access. (Bug
caught by Daniel G.)
---
 Src/MultiGridOctreeData.IsoSurface.inl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Src/MultiGridOctreeData.IsoSurface.inl b/Src/MultiGridOctreeData.IsoSurface.inl
index e81969d..53e6df2 100644
--- a/Src/MultiGridOctreeData.IsoSurface.inl
+++ b/Src/MultiGridOctreeData.IsoSurface.inl
@@ -268,8 +268,11 @@ Real Octree< Real >::GetIsoValue( const DenseNodeData< Real , FEMDegree >& solut
 			}
 			nodeValues[i] = value;
 			int idx = nodeWeights.index( _sNodes.treeNodes[i] );
-			Real w = nodeWeights.data[ idx ];
-			if( w!=0 ) isoValue += value * w , weightSum += w;
+			if( idx!=-1 )
+			{
+				Real w = nodeWeights.data[ idx ];
+				if( w!=0 ) isoValue += value * w , weightSum += w;
+			}
 		}
 	}
 	metSolution.resize( 0 );