OverflowError when searching for IPv6 prefix in the navbar

[lunkwill42]

If I attempt to search for an IPv6 prefix, like fe80::/64, in the navbar, the result is a crashpage with an OverflowError. Traceback as follows:

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/source/python/nav/web/info/views.py" in index
  45.             searchproviders = process_form(form)
File "/source/python/nav/web/info/views.py" in process_form
  67.                        providers.NetboxSearchProvider(query),
File "/source/python/nav/web/info/searchproviders.py" in __init__
  51.         self.fetch_results()
File "/source/python/nav/web/info/searchproviders.py" in fetch_results
  84.         if is_valid_ip(self.query):
File "/source/python/nav/util.py" in is_valid_ip
  74.         return _is_valid_ip_ipy(ip)
File "/source/python/nav/util.py" in _is_valid_ip_ipy
  101.             if len(valid_ip) == 1:

Exception Type: OverflowError at /search/
Exception Value: long int too large to convert to int