From 4e0237a1bf6a34ef10b85c2af69d63882365b37f Mon Sep 17 00:00:00 2001
From: Marshall Greenblatt <magreenblatt@gmail.com>
Date: Thu, 12 Jan 2023 15:55:21 -0500
Subject: [PATCH] Fix crash calling GetUserData on a non-user V8 object (fixes
 issue #3438)

---
 libcef/renderer/v8_impl.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libcef/renderer/v8_impl.cc b/libcef/renderer/v8_impl.cc
index b42c53359..6fa895134 100644
--- a/libcef/renderer/v8_impl.cc
+++ b/libcef/renderer/v8_impl.cc
@@ -295,7 +295,8 @@ class V8TrackObject : public CefTrackNode {
   static V8TrackObject* Unwrap(v8::Local<v8::Context> context,
                                v8::Local<v8::Object> object) {
     v8::Local<v8::Value> value;
-    if (GetPrivate(context, object, kCefTrackObject, &value)) {
+    if (GetPrivate(context, object, kCefTrackObject, &value) &&
+        value->IsExternal()) {
       return static_cast<V8TrackObject*>(v8::External::Cast(*value)->Value());
     }
 
@@ -351,7 +352,8 @@ class V8TrackArrayBuffer : public CefTrackNode {
   static V8TrackArrayBuffer* Unwrap(v8::Local<v8::Context> context,
                                     v8::Local<v8::Object> object) {
     v8::Local<v8::Value> value;
-    if (GetPrivate(context, object, kCefTrackObject, &value)) {
+    if (GetPrivate(context, object, kCefTrackObject, &value) &&
+        value->IsExternal()) {
       return static_cast<V8TrackArrayBuffer*>(
           v8::External::Cast(*value)->Value());
     }