From 635153b3a4d5e203e446f0b1f547365f7c2769c4 Mon Sep 17 00:00:00 2001
From: Kim Kulling <kimkulling@users.noreply.github.com>
Date: Wed, 22 Dec 2021 21:08:28 +0100
Subject: [PATCH] LWS-Import: Avoid access to empty string token

- Fix invalid access to string pointer when string token is empty
- closes https://github.com/assimp/assimp/issues/4222
---
 code/AssetLib/LWS/LWSLoader.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/code/AssetLib/LWS/LWSLoader.cpp b/code/AssetLib/LWS/LWSLoader.cpp
index cb07787fa..cf04579b0 100644
--- a/code/AssetLib/LWS/LWSLoader.cpp
+++ b/code/AssetLib/LWS/LWSLoader.cpp
@@ -537,6 +537,11 @@ void LWSImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
 
     // get file format version and print to log
     ++it;
+    
+    if ((*it).tokens[0].empty()) {
+        ASSIMP_LOG_ERROR("Invalid LWS file detectedm abort import.");
+        return;
+    }
     unsigned int version = strtoul10((*it).tokens[0].c_str());
     ASSIMP_LOG_INFO("LWS file format version is ", (*it).tokens[0]);
     first = 0.;