From 4b369e03b45a4abef975dd19773f6886e6f2c3ae Mon Sep 17 00:00:00 2001
From: Marshall Greenblatt <magreenblatt@gmail.com>
Date: Mon, 5 Nov 2012 22:33:26 +0000
Subject: [PATCH] Fix potential crash if a context with no bindings is released
 (issue #736).

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1180@901 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
---
 cef1/libcef/v8_impl.cc          | 3 +++
 cef3/libcef/renderer/v8_impl.cc | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/cef1/libcef/v8_impl.cc b/cef1/libcef/v8_impl.cc
index 584092420..a18223437 100644
--- a/cef1/libcef/v8_impl.cc
+++ b/cef1/libcef/v8_impl.cc
@@ -118,6 +118,9 @@ class CefV8TrackManager {
 
       v8::Handle<v8::Object> object = context->Global();
       v8::Handle<v8::Value> value = object->GetHiddenValue(context_state_key_);
+      if (value.IsEmpty())
+       return;
+
       scoped_refptr<CefV8ContextState> state =
           static_cast<CefV8ContextState*>(v8::External::Unwrap(value));
       state->Detach();
diff --git a/cef3/libcef/renderer/v8_impl.cc b/cef3/libcef/renderer/v8_impl.cc
index 1a13513bd..178ecc94f 100644
--- a/cef3/libcef/renderer/v8_impl.cc
+++ b/cef3/libcef/renderer/v8_impl.cc
@@ -116,6 +116,9 @@ class CefV8TrackManager {
 
       v8::Handle<v8::Object> object = context->Global();
       v8::Handle<v8::Value> value = object->GetHiddenValue(context_state_key_);
+      if (value.IsEmpty())
+        return;
+
       scoped_refptr<CefV8ContextState> state =
           static_cast<CefV8ContextState*>(v8::External::Unwrap(value));
       state->Detach();