[tor-bugs] #7598 [Stem]: Crash in StreamEvent handler

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#7598: Crash in StreamEvent handler
----------------------+-----------------------------------------------------
 Reporter:  robinson  |          Owner:  atagar
     Type:  defect    |         Status:  new   
 Priority:  normal    |      Milestone:        
Component:  Stem      |        Version:        
 Keywords:  events    |         Parent:  #7328 
   Points:            |   Actualpoints:        
----------------------+-----------------------------------------------------
 Now that there is some event handling, I've begun trying to develop
 against Stem and I found this crash:
 {{{
   File "/usr/lib64/python2.7/site-packages/stem/response/events.py", line
 55, in _parse_message
     self._parse()
   File "/usr/lib64/python2.7/site-packages/stem/response/events.py", line
 459, in _parse
     raise stem.ProtocolError("Source location's port is invalid: %s" %
 self)
 ProtocolError: Source location's port is invalid: STREAM 14 NEW 0
 176.28.51.238.$649F2D0ACF418F7CFC6539AB2257EB2D5297BAFA.exit:443
 SOURCE_ADDR=(Tor_internal):0 PURPOSE=DIR_FETCH
 }}}

 StreamEvent should use is_valid_port(port, allow-zero=True) due to
 DIR_FETCH.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7598>
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