From dae7b68d5cabf13a8960d365c9c16560d892a11f Mon Sep 17 00:00:00 2001
From: Joel Dice <git@seibutsu.mailsnare.net>
Date: Tue, 30 Jun 2009 17:35:28 -0600
Subject: [PATCH] avoid indexing past the end of the array in
 makeSimpleFrameMapTable

---
 src/compile.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/compile.cpp b/src/compile.cpp
index 95549702e0..9abb064273 100644
--- a/src/compile.cpp
+++ b/src/compile.cpp
@@ -4744,8 +4744,10 @@ makeSimpleFrameMapTable(MyThread* t, Context* context, uint8_t* start,
     assert(t, context->traceLogCount + ceiling((i + 1) * mapSize, 32)
            <= intArrayLength(t, table));
 
-    copyFrameMap(&intArrayBody(t, table, context->traceLogCount), p->map,
-                 mapSize, i * mapSize, p, 0);
+    if (mapSize) {
+      copyFrameMap(&intArrayBody(t, table, context->traceLogCount), p->map,
+                   mapSize, i * mapSize, p, 0);
+    }
   }
 
   return table;