From 735f75a16bdca48d78469fd0a04e383bf268344b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Delf=20Neum=C3=A4rker?= <delf@nmrkr.de>
Date: Thu, 18 Feb 2021 22:43:39 +0100
Subject: Fix handling of negative indices in SurfaceTool

---
 scene/resources/surface_tool.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scene/resources/surface_tool.cpp b/scene/resources/surface_tool.cpp
index 5ce3532d42..47933bd69a 100644
--- a/scene/resources/surface_tool.cpp
+++ b/scene/resources/surface_tool.cpp
@@ -299,6 +299,7 @@ void SurfaceTool::add_triangle_fan(const Vector<Vector3> &p_vertices, const Vect
 
 void SurfaceTool::add_index(int p_index) {
 	ERR_FAIL_COND(!begun);
+	ERR_FAIL_COND(p_index < 0);
 
 	format |= Mesh::ARRAY_FORMAT_INDEX;
 	index_array.push_back(p_index);
-- 
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