From fb5b5e9d40b15b7f502e5c7cd99521d9b5e21eba Mon Sep 17 00:00:00 2001
From: Kim Kulling <kimkulling@users.noreply.github.com>
Date: Tue, 21 Sep 2021 11:06:18 +0200
Subject: [PATCH] Fix possible nullptr dereferencing in material parsing

* Return 0.0f for empty buffer
* closes https://github.com/assimp/assimp/issues/3442
---
 code/AssetLib/Obj/ObjFileMtlImporter.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/code/AssetLib/Obj/ObjFileMtlImporter.cpp b/code/AssetLib/Obj/ObjFileMtlImporter.cpp
index 94e57c26b..6a81fb082 100644
--- a/code/AssetLib/Obj/ObjFileMtlImporter.cpp
+++ b/code/AssetLib/Obj/ObjFileMtlImporter.cpp
@@ -232,6 +232,12 @@ void ObjFileMtlImporter::getIlluminationModel(int &illum_model) {
 //  Loads a single float value.
 void ObjFileMtlImporter::getFloatValue(ai_real &value) {
     m_DataIt = CopyNextWord<DataArrayIt>(m_DataIt, m_DataItEnd, &m_buffer[0], BUFFERSIZE);
+    size_t len = std::strlen(&m_buffer[0]);
+    if (0 == len) {
+        value = 0.0f;
+        return;
+    }
+    
     value = (ai_real)fast_atof(&m_buffer[0]);
 }