From e667485f6813f1f1f4ed8c8370df0e06ddba7305 Mon Sep 17 00:00:00 2001
From: Bart van Strien <bart.bes+projects@gmail.com>
Date: Sat, 26 Apr 2014 14:35:39 +0200
Subject: [PATCH] Check argument count of newChainShape

---
 src/modules/physics/box2d/Physics.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/modules/physics/box2d/Physics.cpp b/src/modules/physics/box2d/Physics.cpp
index a76aca20f..a016c7a05 100644
--- a/src/modules/physics/box2d/Physics.cpp
+++ b/src/modules/physics/box2d/Physics.cpp
@@ -133,12 +133,12 @@ int Physics::newPolygonShape(lua_State *L)
 int Physics::newChainShape(lua_State *L)
 {
 	int argc = lua_gettop(L)-1; // first argument is looping
+	if (argc % 2 != 0)
+		return luaL_error(L, "Number of vertex components must be a multiple of two.");
+
 	int vcount = (int)argc/2;
-
 	b2ChainShape *s = new b2ChainShape();
-
 	bool loop = luax_toboolean(L, 1);
-
 	b2Vec2 *vecs = new b2Vec2[vcount];
 
 	for (int i = 0; i<vcount; i++)
@@ -166,7 +166,6 @@ int Physics::newChainShape(lua_State *L)
 	delete[] vecs;
 
 	ChainShape *c = new ChainShape(s);
-
 	luax_pushtype(L, "ChainShape", PHYSICS_CHAIN_SHAPE_T, c);
 	return 1;
 }