Fix Mac sandbox meta data access

content/common/sandbox_mac.mm

 // 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 "content/common/sandbox_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <CoreFoundation/CFTimeZone.h>
 extern "C" {
@@ skipping 96 matching lines @@
   DLOG(FATAL) << "String quoting failed " << bad_string;
 }
 
 }  // namespace
 
 // static
 NSString* Sandbox::AllowMetadataForPath(const base::FilePath& allowed_path) {
   // Collect a list of all parent directories.
   base::FilePath last_path = allowed_path;
   std::vector<base::FilePath> subpaths;
-  for (base::FilePath path = allowed_path;
-       path.value() != last_path.value();
-       path = path.DirName()) {
+
+  base::FilePath path = allowed_path;
+  do {
     subpaths.push_back(path);
+
     last_path = path;
-  }
+    path = path.DirName();
+  } while (path.value() != last_path.value());
 
   // Iterate through all parents and allow stat() on them explicitly.
   NSString* sandbox_command = @"(allow file-read-metadata ";
   for (std::vector<base::FilePath>::reverse_iterator i = subpaths.rbegin();
        i != subpaths.rend();
        ++i) {
     std::string subdir_escaped;
     if (!QuotePlainString(i->value(), &subdir_escaped)) {
       FatalStringQuoteException(i->value());
       return nil;
@@ skipping 481 matching lines @@
   if (HANDLE_EINTR(fcntl(fd.get(), F_GETPATH, canonical_path)) != 0) {
     DPLOG(FATAL) << "GetCanonicalSandboxPath() failed for: "
                  << path.value();
     return path;
   }
 
   return base::FilePath(canonical_path);
 }
 
 }  // namespace content