From 0dad504e9185622d3d8e2bd90defedfd7aae56e9 Mon Sep 17 00:00:00 2001
From: jean-pierre charras <jp.charras@wanadoo.fr>
Date: Wed, 8 Dec 2021 15:57:22 +0100
Subject: [PATCH] POLY_GRID_PARTITION: detect a divide by 0, set a wxASSERT and
 avoid the crash.

---
 libs/kimath/src/geometry/poly_grid_partition.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libs/kimath/src/geometry/poly_grid_partition.cpp b/libs/kimath/src/geometry/poly_grid_partition.cpp
index b0adf4f781..62a8f0ac57 100644
--- a/libs/kimath/src/geometry/poly_grid_partition.cpp
+++ b/libs/kimath/src/geometry/poly_grid_partition.cpp
@@ -151,6 +151,12 @@ bool POLY_GRID_PARTITION::checkClearance( const VECTOR2I& aP, int aClearance )
 int POLY_GRID_PARTITION::rescale_trunc( int aNumerator, int aValue, int aDenominator ) const
 {
     int64_t numerator = (int64_t) aNumerator * (int64_t) aValue;
+
+    wxASSERT( aDenominator != 0 );
+
+    if( aDenominator == 0 )     // Avoid crash when divide by 0
+        aDenominator = 1;
+
     return numerator / aDenominator;
 }