From 1c4f61ec5068a5935eb6d5dd1d6f2c0275b70529 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 29 Sep 2009 03:01:37 +0100
Subject: [PATCH] [tessellator] Invalid conversion of list head to edge.

When scanning for collinear right edges, we need to check that we do not
go beyond the end of the array.
---
 src/cairo-bentley-ottmann-rectangular.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cairo-bentley-ottmann-rectangular.c b/src/cairo-bentley-ottmann-rectangular.c
index 53faba6b4..9887b8242 100644
--- a/src/cairo-bentley-ottmann-rectangular.c
+++ b/src/cairo-bentley-ottmann-rectangular.c
@@ -380,6 +380,8 @@ _active_edges_to_traps (cairo_bo_sweep_line_t	*sweep,
 			break;
 		    }
 
+		    if (right->link.next == &sweep->sweep)
+			break;
 		    right = link_to_edge (right->link.next);
 		}
 	    }