From a80b3b25ebba38a04afc8a72ad46c66759b4a640 Mon Sep 17 00:00:00 2001
From: Jason C <jason.cipriani@gmail.com>
Date: Wed, 5 May 2021 17:31:50 -0400
Subject: [PATCH] [quick3d] Fix assertion failure when file could not be
 opened.

Check result of IOSystem::Open before constructing stream.

Partially addresses #3888.
---
 code/AssetLib/Q3D/Q3DLoader.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/code/AssetLib/Q3D/Q3DLoader.cpp b/code/AssetLib/Q3D/Q3DLoader.cpp
index b52f86672..710dd52ac 100644
--- a/code/AssetLib/Q3D/Q3DLoader.cpp
+++ b/code/AssetLib/Q3D/Q3DLoader.cpp
@@ -106,7 +106,12 @@ const aiImporterDesc *Q3DImporter::GetInfo() const {
 // Imports the given file into the given scene structure.
 void Q3DImporter::InternReadFile(const std::string &pFile,
         aiScene *pScene, IOSystem *pIOHandler) {
-    StreamReaderLE stream(pIOHandler->Open(pFile, "rb"));
+
+    auto file = pIOHandler->Open(pFile, "rb");
+    if (!file)
+        throw DeadlyImportError("Quick3D: Could not open ", pFile);
+
+    StreamReaderLE stream(file);
 
     // The header is 22 bytes large
     if (stream.GetRemainingSize() < 22)