Error out in `gclient config` if --name is relative

gclient.py

 #!/usr/bin/env python
 # 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.
 
 """Meta checkout manager supporting both Subversion and GIT."""
 # Files
 #   .gclient      : Current client configuration, written by 'config' command.
 #                   Format is a Python script defining 'solutions', a list whose
 #                   entries each are maps binding the strings "name" and "url"
@@ skipping 1868 matching lines @@
     client.SetConfig(options.spec)
   else:
     base_url = args[0].rstrip('/')
     if not options.name:
       name = base_url.split('/')[-1]
       if name.endswith('.git'):
         name = name[:-4]
     else:
       # specify an alternate relpath for the given URL.
       name = options.name
+      if not os.path.abspath(os.path.join(os.getcwd(), name)).startswith(
+          os.getcwd()):
+        parser.error('Do not pass a relative path for --name.')
+      if any(x in ('..', '.', '/', '\\') for x in name.split(os.sep)):
+        parser.error('Do not include relative path components in --name.')
+
     deps_file = options.deps_file
     safesync_url = ''
     if len(args) > 1:
       safesync_url = args[1]
     client.SetDefaultConfig(name, deps_file, base_url, safesync_url,
                             managed=not options.unmanaged,
                             cache_dir=options.cache_dir)
   client.SaveConfig()
   return 0
 
@@ skipping 410 matching lines @@
 
 
 if '__main__' == __name__:
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)
 
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