Allow relative paths to external extension files for some providers, error out for others.

chrome/browser/extensions/external_registry_extension_loader_win.cc

 // Copyright (c) 2010 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/extensions/external_registry_extension_loader_win.h"
 
 #include "base/file_path.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 32 matching lines @@
   scoped_ptr<DictionaryValue> prefs(new DictionaryValue);
 
   base::win::RegistryKeyIterator iterator(
       kRegRoot, ASCIIToWide(kRegistryExtensions).c_str());
   while (iterator.Valid()) {
     base::win::RegKey key;
     std::wstring key_path = ASCIIToWide(kRegistryExtensions);
     key_path.append(L"\\");
     key_path.append(iterator.Name());
     if (key.Open(kRegRoot, key_path.c_str(), KEY_READ)) {
-      std::wstring extension_path;
-      if (key.ReadValue(kRegistryExtensionPath, &extension_path)) {
+      std::wstring extension_path_str;
+      if (key.ReadValue(kRegistryExtensionPath, &extension_path_str)) {
+        FilePath extension_path(extension_path_str);
+        if (!extension_path.IsAbsolute()) {
+          LOG(ERROR) << "Path " << extension_path_str
+                     << " needs to be absolute in key "
+                     << key_path;
+          ++iterator;
+          continue;
+        }
+
         std::wstring extension_version;
         if (key.ReadValue(kRegistryExtensionVersion, &extension_version)) {
           std::string id = WideToASCII(iterator.Name());
           StringToLowerASCII(&id);
 
           if (!Extension::IdIsValid(id)) {
             LOG(ERROR) << "Invalid id value " << id
                        << " for key " << key_path << " .";
             ++iterator;
             continue;
           }
 
           scoped_ptr<Version> version;
           version.reset(Version::GetVersionFromString(
                             WideToASCII(extension_version)));
           if (!version.get()) {
             LOG(ERROR) << "Invalid version value " << extension_version
                        << " for key " << key_path << " .";
             ++iterator;
             continue;
           }
 
           prefs->SetString(
               id + "." + ExternalExtensionProviderImpl::kExternalVersion,
               WideToASCII(extension_version));
           prefs->SetString(
               id + "." + ExternalExtensionProviderImpl::kExternalCrx,
-              extension_path);
+              extension_path_str);
         } else {
           // TODO(erikkay): find a way to get this into about:extensions
           LOG(ERROR) << "Missing value " << kRegistryExtensionVersion
                      << " for key " << key_path << " .";
         }
       } else {
         // TODO(erikkay): find a way to get this into about:extensions
         LOG(ERROR) << "Missing value " << kRegistryExtensionPath
                    << " for key " << key_path << " .";
       }
     }
     ++iterator;
   }
 
   prefs_.reset(prefs.release());
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(
           this,
           &ExternalRegistryExtensionLoader::LoadFinished));
 }