From 2fc07561f1a7ca35dbb9a73a01e1d41ef51b9252 Mon Sep 17 00:00:00 2001
From: Maciej Suminski <maciej.suminski@cern.ch>
Date: Thu, 21 Dec 2017 09:49:55 +0100
Subject: [PATCH] Fix crash when drawing a polygon with empty outline

In theory there should be no polygons with empty outline, but as you see
there was at least one leading to a crash.

Fixes: lp:1739455
* https://bugs.launchpad.net/kicad/+bug/1739455
---
 common/gal/opengl/opengl_gal.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/gal/opengl/opengl_gal.cpp b/common/gal/opengl/opengl_gal.cpp
index 616580ddce..66b696fd89 100644
--- a/common/gal/opengl/opengl_gal.cpp
+++ b/common/gal/opengl/opengl_gal.cpp
@@ -822,6 +822,10 @@ void OPENGL_GAL::DrawPolygon( const SHAPE_POLY_SET& aPolySet )
     for( int j = 0; j < aPolySet.OutlineCount(); ++j )
     {
         const SHAPE_LINE_CHAIN& outline = aPolySet.COutline( j );
+
+        if( outline.SegmentCount() == 0 )
+            continue;
+
         const int pointCount = outline.SegmentCount() + 1;
         std::unique_ptr<GLdouble[]> points( new GLdouble[3 * pointCount] );
         GLdouble* ptr = points.get();