From c5c52c3dfd77cb017cb2476b849759efd1d56bf9 Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <hillbrand@ucdavis.edu>
Date: Thu, 7 Jun 2018 23:15:10 -0700
Subject: [PATCH] pcbnew Check for valid nodes before drawing ratsnest

We can invalidate a node by rotating.  Make sure that our endpoints for
the ratsnest are valid before attempting to draw.

Fixes: lp:1775727
* https://bugs.launchpad.net/kicad/+bug/1775727
---
 pcbnew/ratsnest.cpp          | 3 +++
 pcbnew/ratsnest_viewitem.cpp | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/pcbnew/ratsnest.cpp b/pcbnew/ratsnest.cpp
index 4e33ee235b..1040723dbb 100644
--- a/pcbnew/ratsnest.cpp
+++ b/pcbnew/ratsnest.cpp
@@ -115,6 +115,9 @@ void PCB_BASE_FRAME::DrawGeneralRatsnest( wxDC* aDC, int aNetcode )
                 auto sn = edge.GetSourceNode();
                 auto dn = edge.GetTargetNode();
 
+                if( !sn->Valid() || !dn->Valid() )
+                    continue;
+
                 bool enable = !sn->GetNoLine() && !dn->GetNoLine();
                 bool show = sn->Parent()->GetLocalRatsnestVisible()
                             || dn->Parent()->GetLocalRatsnestVisible();
diff --git a/pcbnew/ratsnest_viewitem.cpp b/pcbnew/ratsnest_viewitem.cpp
index 522de670b2..27d22b9790 100644
--- a/pcbnew/ratsnest_viewitem.cpp
+++ b/pcbnew/ratsnest_viewitem.cpp
@@ -109,6 +109,9 @@ void RATSNEST_VIEWITEM::ViewDraw( int aLayer, KIGFX::VIEW* aView ) const
             const VECTOR2I source( sourceNode->Pos() );
             const VECTOR2I target( targetNode->Pos() );
 
+            if( !sourceNode->Valid() || !targetNode->Valid() )
+                continue;
+
             bool enable =  !sourceNode->GetNoLine() && !targetNode->GetNoLine();
             bool show = sourceNode->Parent()->GetLocalRatsnestVisible() || targetNode->Parent()->GetLocalRatsnestVisible();