[tor-bugs] #3175 [Tor Client]: smartlist_string_num_isin's buffer is too short

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#3175: smartlist_string_num_isin's buffer is too short
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 Reporter:  rransom     |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  trivial     |      Milestone:  Tor: 0.2.2.x-final
Component:  Tor Client  |        Version:                    
 Keywords:  easy        |         Parent:                    
   Points:              |   Actualpoints:                    
------------------------+---------------------------------------------------
 `smartlist_string_num_isin` converts an int to a 15-character or shorter
 string.  Its 16-byte buffer is not long enough to handle all 64-bit ints
 (-2^63^ is 20 characters long, so the buffer would need to be at least 21
 bytes long).

 We currently only use this function for (16-bit) TCP port numbers, so this
 bug doesn't actually hurt anything, but we shouldn't leave an even
 slightly incorrect function lying around to bite us later.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3175>
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