From 885a4c1bc597fefd29e39634d7f342901b3d3958 Mon Sep 17 00:00:00 2001
From: Jean-Samuel Reynaud <js.reynaud@gmail.com>
Date: Thu, 6 Jul 2017 10:40:52 +0200
Subject: [PATCH] Avoid an infinite loop in PNS

Fixes: lp:1702485
* https://bugs.launchpad.net/kicad/+bug/1702485
---
 pcbnew/router/pns_diff_pair.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pcbnew/router/pns_diff_pair.cpp b/pcbnew/router/pns_diff_pair.cpp
index 0279e1bd9f..60889072fd 100644
--- a/pcbnew/router/pns_diff_pair.cpp
+++ b/pcbnew/router/pns_diff_pair.cpp
@@ -410,6 +410,10 @@ static VECTOR2I makeGapVector( VECTOR2I dir, int length )
 {
     int l = length / 2;
     VECTOR2I rv;
+
+    if( dir.EuclideanNorm() == 0 )
+        return dir;
+
     do
 	{
         rv = dir.Resize( l );