Fixed crashes when data is NULL.

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/print_preview/print_preview_handler.h"
 
 #include <ctype.h>
 
 #include <string>
 #include <vector>
@@ skipping 696 matching lines @@
   }
 }
 
 void PrintPreviewHandler::SendCloudPrintJob(const DictionaryValue& settings,
                                             std::string print_ticket) {
   scoped_refptr<base::RefCountedBytes> data;
   PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
       web_ui()->GetController());
   print_preview_ui->GetPrintPreviewDataForIndex(
       printing::COMPLETE_PREVIEW_DOCUMENT_INDEX, &data);
-  if (data->size() > 0U && data->front()) {
+  if (data.get() && data->size() > 0U && data->front()) {
     string16 print_job_title_utf16 =
         preview_tab_wrapper()->print_view_manager()->RenderSourceName();
     std::string print_job_title = UTF16ToUTF8(print_job_title_utf16);
     std::string printer_id;
     settings.GetString(printing::kSettingCloudPrintId, &printer_id);
     // BASE64 encode the job data.
     std::string raw_data(reinterpret_cast<const char*>(data->front()),
                          data->size());
     std::string base64_data;
     if (!base::Base64Encode(raw_data, &base64_data)) {
@@ skipping 105 matching lines @@
   // Updating |save_path_| to the newly selected folder.
   GetStickySettings()->StoreSavePath(path.DirName());
 
   PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
       web_ui()->GetController());
   print_preview_ui->web_ui()->CallJavascriptFunction("fileSelectionCompleted");
   scoped_refptr<base::RefCountedBytes> data;
   print_preview_ui->GetPrintPreviewDataForIndex(
       printing::COMPLETE_PREVIEW_DOCUMENT_INDEX, &data);
   print_to_pdf_path_.reset(new FilePath(path));
-  if (data.get())
-    PostPrintToPdfTask(data);
+  PostPrintToPdfTask(data);
 }
 
-void PrintPreviewHandler::PostPrintToPdfTask(
-    scoped_refptr<base::RefCountedBytes> data) {
+void PrintPreviewHandler::PostPrintToPdfTask(base::RefCountedBytes* data) {
+  if (!data) {
+    NOTREACHED();
+    return;
+  }
   printing::PreviewMetafile* metafile = new printing::PreviewMetafile;
   metafile->InitFromData(static_cast<const void*>(data->front()), data->size());
   // PrintToPdfCallback takes ownership of |metafile|.
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
                           base::Bind(&PrintToPdfCallback, metafile,
                                      *print_to_pdf_path_));
   print_to_pdf_path_.reset();
   ActivateInitiatorTabAndClosePreviewTab();
 }
 
 void PrintPreviewHandler::FileSelectionCanceled(void* params) {
   PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
       web_ui()->GetController());
   print_preview_ui->OnFileSelectionCancelled();
 }
 
 void PrintPreviewHandler::ClearInitiatorTabDetails() {
   TabContentsWrapper* initiator_tab = GetInitiatorTab();
   if (!initiator_tab)
     return;
 
   // We no longer require the initiator tab details. Remove those details
   // associated with the preview tab to allow the initiator tab to create
   // another preview tab.
   printing::PrintPreviewTabController* tab_controller =
       printing::PrintPreviewTabController::GetInstance();
   if (tab_controller)
     tab_controller->EraseInitiatorTabInfo(preview_tab_wrapper());
 }