From b14b34d2b8954f6cc7fd25a8f7d20ad8f94faa27 Mon Sep 17 00:00:00 2001
From: Alex Rebert <alexandre.rebert@gmail.com>
Date: Wed, 5 Jan 2022 15:19:06 -0500
Subject: [PATCH] LWSLoader: Fix out of bounds iterator access

Fix https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38947
Fix #4222
---
 code/AssetLib/LWS/LWSLoader.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/code/AssetLib/LWS/LWSLoader.cpp b/code/AssetLib/LWS/LWSLoader.cpp
index cf04579b0..e046b6f58 100644
--- a/code/AssetLib/LWS/LWSLoader.cpp
+++ b/code/AssetLib/LWS/LWSLoader.cpp
@@ -537,8 +537,8 @@ void LWSImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSy
 
     // get file format version and print to log
     ++it;
-    
-    if ((*it).tokens[0].empty()) {
+
+    if (it == root.children.end() || (*it).tokens[0].empty()) {
         ASSIMP_LOG_ERROR("Invalid LWS file detectedm abort import.");
         return;
     }