From 3c010fc2f9542c892c78f3f0df3b32e2b88d6a5d Mon Sep 17 00:00:00 2001
From: Filippos Karapetis
Date: Tue, 17 Aug 2010 22:51:24 +0000
Subject: SCI: Fixed bug #3034501 - "LSL6: Segfault while leaving the
 penthouse"

svn-id: r52174
---
 engines/sci/engine/kpathing.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'engines')

diff --git a/engines/sci/engine/kpathing.cpp b/engines/sci/engine/kpathing.cpp
index 07d0a31f0b..89ba309288 100644
--- a/engines/sci/engine/kpathing.cpp
+++ b/engines/sci/engine/kpathing.cpp
@@ -1106,6 +1106,12 @@ static Polygon *convert_polygon(EngineState *s, reg_t polygon) {
 		}
 	}
 
+	// Check if the target polygon is still valid. It may have been released
+	// in the meantime (e.g. in LSL6, room 700, when using the elevator).
+	// Refer to bug #3034501.
+	if (segMan->getSegmentType(points.segment) != SEG_TYPE_DYNMEM)
+		return NULL;
+
 	for (i = skip; i < size; i++) {
 		Vertex *vertex = new Vertex(read_point(segMan, points, i));
 		poly->vertices.insertHead(vertex);
-- 
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