From 4fc6ca3c3b8a2588655ccb156e340385b7f2e59f Mon Sep 17 00:00:00 2001
From: Eric Fischer <enf@pobox.com>
Date: Mon, 21 Mar 2016 17:23:34 -0700
Subject: [PATCH] Keep from getting stuck in an infinite loop

---
 clipper/clipper.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/clipper/clipper.cpp b/clipper/clipper.cpp
index 97032989..ab7cb46b 100644
--- a/clipper/clipper.cpp
+++ b/clipper/clipper.cpp
@@ -1640,8 +1640,13 @@ void Clipper::FixHoleLinkage(OutRec &outrec)
       outrec.FirstLeft->Pts)) return;
 
   OutRec* orfl = outrec.FirstLeft;
-  while (orfl && ((orfl->IsHole == outrec.IsHole) || !orfl->Pts))
+  OutRec* first = orfl;
+  while (orfl && ((orfl->IsHole == outrec.IsHole) || !orfl->Pts)) {
       orfl = orfl->FirstLeft;
+      if (orfl == first) {
+          break;
+      }
+  }
   outrec.FirstLeft = orfl;
 }
 //------------------------------------------------------------------------------