From d842d215df2e4a9d0ed6231232f6301d825da1d7 Mon Sep 17 00:00:00 2001
From: Chris Hutchinson <chris.s.hutchinson@gmail.com>
Date: Mon, 13 Feb 2023 19:35:16 -0500
Subject: [PATCH] Prevent crash in ImmediateMesh.create_outline by ensuring
 that when no indices are specified, the number of vertices is at least a
 factor of 3. Fixes #73201

---
 scene/resources/mesh.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scene/resources/mesh.cpp b/scene/resources/mesh.cpp
index cf9baa29073..a7b53244e24 100644
--- a/scene/resources/mesh.cpp
+++ b/scene/resources/mesh.cpp
@@ -526,6 +526,9 @@ Ref<Mesh> Mesh::create_outline(float p_margin) const {
 			vc = indices.size();
 			ir = indices.ptrw();
 			has_indices = true;
+		} else {
+			// Ensure there are enough vertices to construct at least one triangle.
+			ERR_FAIL_COND_V(vertices.size() % 3 != 0, Ref<ArrayMesh>());
 		}
 
 		HashMap<Vector3, Vector3> normal_accum;