From cf966391190a5c6b00feeb0f3250202c3d01ff00 Mon Sep 17 00:00:00 2001
From: Kim Kulling <kimkulling@users.noreply.github.com>
Date: Thu, 24 Feb 2022 16:49:35 +0100
Subject: [PATCH] Fix possible negative array access

- Return when the calculated offset gets negative
- closes https://github.com/assimp/assimp/issues/4414
---
 include/assimp/Hash.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/assimp/Hash.h b/include/assimp/Hash.h
index 1f2baedac..1a5d1f08d 100644
--- a/include/assimp/Hash.h
+++ b/include/assimp/Hash.h
@@ -4,7 +4,6 @@ Open Asset Import Library (assimp)
 
 Copyright (c) 2006-2022, assimp team
 
-
 All rights reserved.
 
 Redistribution and use of this software in source and binary forms,
@@ -96,7 +95,11 @@ int rem;
     switch (rem) {
         case 3: hash += get16bits (data);
                 hash ^= hash << 16;
-                hash ^= data[sizeof (uint16_t)] << 18;
+                size_t offset = static_cast<size_t>(sizeof(uint16_t));
+                if (offset < 0) {
+                    return 0;
+                }
+                hash ^= data[offset] << 18;
                 hash += hash >> 11;
                 break;
         case 2: hash += get16bits (data);