From 60ddafa4ff5263b26d17bd19a99806777884e794 Mon Sep 17 00:00:00 2001
From: Jon Evans <jon@craftyjon.com>
Date: Thu, 30 Nov 2023 17:08:37 -0500
Subject: [PATCH] Guard against UNDEFINED_LAYER in GetLayerSet

Fixes https://gitlab.com/kicad/code/kicad/-/issues/16230


(cherry picked from commit 1ff3b5a4370614985840683371ee77105fa0940a)
---
 pcbnew/pcb_track.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pcbnew/pcb_track.cpp b/pcbnew/pcb_track.cpp
index 425ad6a9aa..bc668ebdbf 100644
--- a/pcbnew/pcb_track.cpp
+++ b/pcbnew/pcb_track.cpp
@@ -506,6 +506,9 @@ LSET PCB_VIA::GetLayerSet() const
 {
     LSET layermask;
 
+    if( m_layer < PCBNEW_LAYER_ID_START )
+        return layermask;
+
     if( GetViaType() == VIATYPE::THROUGH )
         layermask = LSET::AllCuMask();
     else