From 0d3e8b52be6f6c1465fc1ff885fa16f7b221b7d2 Mon Sep 17 00:00:00 2001
From: Jason C <jason.cipriani@gmail.com>
Date: Wed, 5 May 2021 17:32:10 -0400
Subject: [PATCH] [sib] Fix assertion failure when file could not be opened.

Check result of IOSystem::Open before constructing stream.

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

diff --git a/code/AssetLib/SIB/SIBImporter.cpp b/code/AssetLib/SIB/SIBImporter.cpp
index 6898fb65c..825f20ee2 100644
--- a/code/AssetLib/SIB/SIBImporter.cpp
+++ b/code/AssetLib/SIB/SIBImporter.cpp
@@ -804,7 +804,12 @@ static void ReadScene(SIB *sib, StreamReaderLE *stream) {
 // Imports the given file into the given scene structure.
 void SIBImporter::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("SIB: Could not open ", pFile);
+
+    StreamReaderLE stream(file);
 
     // We should have at least one chunk
     if (stream.GetRemainingSize() < 16)