Check for empty embedder data before using it in PDFium JS bindings.

fpdfsdk/include/javascript/JS_Define.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef FPDFSDK_INCLUDE_JAVASCRIPT_JS_DEFINE_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_JS_DEFINE_H_
 
 #include "../jsapi/fxjs_v8.h"
@@ skipping 65 matching lines @@
           FX_BOOL (C::*M)(IFXJS_Context* cc,
                           CJS_PropValue& vp,
                           CFX_WideString& sError)>
 void JSPropGetter(const char* prop_name_string,
                   const char* class_name_string,
                   v8::Local<v8::String> property,
                   const v8::PropertyCallbackInfo<v8::Value>& info) {
   v8::Isolate* isolate = info.GetIsolate();
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> v = context->GetEmbedderData(1);
+  if (v.IsEmpty())
+    return;
   v8::Local<v8::External> field = v8::Local<v8::External>::Cast(v);
   IFXJS_Runtime* pRuntime = (IFXJS_Runtime*)field->Value();
   IFXJS_Context* pContext = pRuntime->GetCurrentContext();
   CJS_Object* pJSObj = (CJS_Object*)JS_GetPrivate(isolate, info.Holder());
   C* pObj = reinterpret_cast<C*>(pJSObj->GetEmbedObject());
   CFX_WideString sError;
   CJS_PropValue value(isolate);
   value.StartGetting();
   if (!(pObj->*M)(pContext, value, sError)) {
     JS_Error(isolate,
              JSFormatErrorString(class_name_string, prop_name_string, sError));
     return;
   }
   info.GetReturnValue().Set((v8::Local<v8::Value>)value);
 }
 
 template <class C,
           FX_BOOL (C::*M)(IFXJS_Context* cc,
                           CJS_PropValue& vp,
                           CFX_WideString& sError)>
 void JSPropSetter(const char* prop_name_string,
                   const char* class_name_string,
                   v8::Local<v8::String> property,
                   v8::Local<v8::Value> value,
                   const v8::PropertyCallbackInfo<void>& info) {
   v8::Isolate* isolate = info.GetIsolate();
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> v = context->GetEmbedderData(1);
+  if (v.IsEmpty())
+    return;
   v8::Local<v8::External> field = v8::Local<v8::External>::Cast(v);
   IFXJS_Runtime* pRuntime = (IFXJS_Runtime*)field->Value();
   IFXJS_Context* pContext = pRuntime->GetCurrentContext();
   CJS_Object* pJSObj = (CJS_Object*)JS_GetPrivate(isolate, info.Holder());
   C* pObj = reinterpret_cast<C*>(pJSObj->GetEmbedObject());
   CFX_WideString sError;
   CJS_PropValue propValue(CJS_Value(isolate, value, VT_unknown));
   propValue.StartSetting();
   if (!(pObj->*M)(pContext, propValue, sError)) {
     JS_Error(isolate,
@@ skipping 22 matching lines @@
           FX_BOOL (C::*M)(IFXJS_Context* cc,
                           const CJS_Parameters& params,
                           CJS_Value& vRet,
                           CFX_WideString& sError)>
 void JSMethod(const char* method_name_string,
               const char* class_name_string,
               const v8::FunctionCallbackInfo<v8::Value>& info) {
   v8::Isolate* isolate = info.GetIsolate();
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> v = context->GetEmbedderData(1);
+  if (v.IsEmpty())
+    return;
   v8::Local<v8::External> field = v8::Local<v8::External>::Cast(v);
   IFXJS_Runtime* pRuntime = (IFXJS_Runtime*)field->Value();
   IFXJS_Context* cc = pRuntime->GetCurrentContext();
   CJS_Parameters parameters;
   for (unsigned int i = 0; i < (unsigned int)info.Length(); i++) {
     parameters.push_back(CJS_Value(isolate, info[i], VT_unknown));
   }
   CJS_Value valueRes(isolate);
   CJS_Object* pJSObj = (CJS_Object*)JS_GetPrivate(isolate, info.Holder());
   C* pObj = reinterpret_cast<C*>(pJSObj->GetEmbedObject());
@@ skipping 109 matching lines @@
   info.GetReturnValue().Set(bRet ? 4 : 0);
 }
 
 template <class Alt>
 void JSSpecialPropGet(const char* class_name,
                       v8::Local<v8::String> property,
                       const v8::PropertyCallbackInfo<v8::Value>& info) {
   v8::Isolate* isolate = info.GetIsolate();
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> v = context->GetEmbedderData(1);
+  if (v.IsEmpty())
+    return;
   v8::Local<v8::External> field = v8::Local<v8::External>::Cast(v);
   IFXJS_Runtime* pRuntime = (IFXJS_Runtime*)field->Value();
   IFXJS_Context* pRuntimeContext = pRuntime->GetCurrentContext();
   CJS_Object* pJSObj =
       reinterpret_cast<CJS_Object*>(JS_GetPrivate(isolate, info.Holder()));
   Alt* pObj = reinterpret_cast<Alt*>(pJSObj->GetEmbedObject());
   v8::String::Utf8Value utf8_value(property);
   CFX_WideString propname =
       CFX_WideString::FromUTF8(*utf8_value, utf8_value.length());
   CFX_WideString sError;
   CJS_PropValue value(isolate);
   value.StartGetting();
   if (!pObj->DoProperty(pRuntimeContext, propname.c_str(), value, sError)) {
     JS_Error(isolate, JSFormatErrorString(class_name, "GetProperty", sError));
     return;
   }
   info.GetReturnValue().Set((v8::Local<v8::Value>)value);
 }
 
 template <class Alt>
 void JSSpecialPropPut(const char* class_name,
                       v8::Local<v8::String> property,
                       v8::Local<v8::Value> value,
                       const v8::PropertyCallbackInfo<v8::Value>& info) {
   v8::Isolate* isolate = info.GetIsolate();
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> v = context->GetEmbedderData(1);
+  if (v.IsEmpty())
+    return;
   v8::Local<v8::External> field = v8::Local<v8::External>::Cast(v);
   IFXJS_Runtime* pRuntime = (IFXJS_Runtime*)field->Value();
   IFXJS_Context* pRuntimeContext = pRuntime->GetCurrentContext();
   CJS_Object* pJSObj =
       reinterpret_cast<CJS_Object*>(JS_GetPrivate(isolate, info.Holder()));
   Alt* pObj = reinterpret_cast<Alt*>(pJSObj->GetEmbedObject());
   v8::String::Utf8Value utf8_value(property);
   CFX_WideString propname =
       CFX_WideString::FromUTF8(*utf8_value, utf8_value.length());
   CFX_WideString sError;
   CJS_PropValue PropValue(CJS_Value(isolate, value, VT_unknown));
   PropValue.StartSetting();
   if (!pObj->DoProperty(pRuntimeContext, propname.c_str(), PropValue, sError)) {
     JS_Error(isolate, JSFormatErrorString(class_name, "PutProperty", sError));
   }
 }
 
 template <class Alt>
 void JSSpecialPropDel(const char* class_name,
                       v8::Local<v8::String> property,
                       const v8::PropertyCallbackInfo<v8::Boolean>& info) {
   v8::Isolate* isolate = info.GetIsolate();
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> v = context->GetEmbedderData(1);
+  if (v.IsEmpty())
+    return;
   v8::Local<v8::External> field = v8::Local<v8::External>::Cast(v);
   IFXJS_Runtime* pRuntime = (IFXJS_Runtime*)field->Value();
   IFXJS_Context* pRuntimeContext = pRuntime->GetCurrentContext();
   CJS_Object* pJSObj =
       reinterpret_cast<CJS_Object*>(JS_GetPrivate(isolate, info.Holder()));
   Alt* pObj = reinterpret_cast<Alt*>(pJSObj->GetEmbedObject());
   v8::String::Utf8Value utf8_value(property);
   CFX_WideString propname =
       CFX_WideString::FromUTF8(*utf8_value, utf8_value.length());
   CFX_WideString sError;
@@ skipping 91 matching lines @@
 
 template <FX_BOOL (*F)(IFXJS_Context* cc,
                        const CJS_Parameters& params,
                        CJS_Value& vRet,
                        CFX_WideString& sError)>
 void JSGlobalFunc(const char* func_name_string,
                   const v8::FunctionCallbackInfo<v8::Value>& info) {
   v8::Isolate* isolate = info.GetIsolate();
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> v = context->GetEmbedderData(1);
+  if (v.IsEmpty())
+    return;
   v8::Local<v8::External> field = v8::Local<v8::External>::Cast(v);
   IFXJS_Runtime* pRuntime = (IFXJS_Runtime*)field->Value();
   IFXJS_Context* cc = pRuntime->GetCurrentContext();
   CJS_Parameters parameters;
   for (unsigned int i = 0; i < (unsigned int)info.Length(); i++) {
     parameters.push_back(CJS_Value(isolate, info[i], VT_unknown));
   }
   CJS_Value valueRes(isolate);
   CFX_WideString sError;
   if (!(*F)(cc, parameters, valueRes, sError)) {
@@ skipping 24 matching lines @@
   void js_class_name::DefineJSObjects(v8::Isolate* pIsolate) {                \
     for (int i = 0; i < FX_ArraySize(global_methods) - 1; ++i) {              \
       JS_DefineGlobalMethod(pIsolate, js_class_name::global_methods[i].pName, \
                             js_class_name::global_methods[i].pMethodCall);    \
     }                                                                         \
   }
 
 FXJSVALUETYPE GET_VALUE_TYPE(v8::Local<v8::Value> p);
 
 #endif  // FPDFSDK_INCLUDE_JAVASCRIPT_JS_DEFINE_H_