From 79944d4f9065477b6b5c66dc734e5e07082bdab6 Mon Sep 17 00:00:00 2001
From: Aaron Griffith <aargri@gmail.com>
Date: Thu, 23 Jun 2011 17:44:04 -0400
Subject: [PATCH] fixed out-of-bounds index segfault

---
 src/rendermode-lighting.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/rendermode-lighting.c b/src/rendermode-lighting.c
index 0a92554..c515db5 100644
--- a/src/rendermode-lighting.c
+++ b/src/rendermode-lighting.c
@@ -88,6 +88,14 @@ estimate_blocklevel(RenderModeLighting *self, RenderState *state,
         for (dx = -1; dx <= 1; dx += 2) {
             for (dy = -1; dy <= 1; dy += 2) {
                 for (dz = -1; dz <= 1; dz += 2) {
+                    
+                    /* skip if block is out of range */
+                    if (x+dx < 0 || x+dx >= 16 ||
+                        y+dy < 0 || y+dy >= 16 ||
+                        z+dz < 0 || z+dz >= 128) {
+                        continue;
+                    }
+
                     coeff = estimate_blocklevel(self, state, x+dx, y+dy, z+dz, &auth);
                     local_block = getArrayByte3D(blocks, x+dx, y+dy, z+dz);
                     /* only add if the block is transparent, this seems to look better than