From 552f3a308d23a3f9981125ee08555e4b69fd6d31 Mon Sep 17 00:00:00 2001
From: Kim Kulling <kimkulling@users.noreply.github.com>
Date: Wed, 16 Mar 2022 10:08:20 +0100
Subject: [PATCH] Fix nullptr dereferencing

- Check if we have any texture coordinates before calculating them
- closes https://github.com/assimp/assimp/issues/4445
---
 code/AssetLib/MDL/MDLLoader.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/code/AssetLib/MDL/MDLLoader.cpp b/code/AssetLib/MDL/MDLLoader.cpp
index 1e90c8e71..9c9cf910c 100644
--- a/code/AssetLib/MDL/MDLLoader.cpp
+++ b/code/AssetLib/MDL/MDLLoader.cpp
@@ -857,6 +857,9 @@ void MDLImporter::CalculateUVCoordinates_MDL5() {
             const float fHeight = (float)iHeight;
             aiMesh *pcMesh = this->pScene->mMeshes[0];
             for (unsigned int i = 0; i < pcMesh->mNumVertices; ++i) {
+                if (!pcMesh->HasTextureCoords(0)) {
+                    continue;
+                }
                 pcMesh->mTextureCoords[0][i].x /= fWidth;
                 pcMesh->mTextureCoords[0][i].y /= fHeight;
                 pcMesh->mTextureCoords[0][i].y = 1.0f - pcMesh->mTextureCoords[0][i].y; // DX to OGL