[tor-bugs] #8059 [Tor]: miscounting when parsing versions cell

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#8059: miscounting when parsing versions cell
--------------------+-------------------------------------------------------
 Reporter:  arma    |          Owner:                    
     Type:  defect  |         Status:  new               
 Priority:  normal  |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor     |        Version:                    
 Keywords:          |         Parent:                    
   Points:          |   Actualpoints:                    
--------------------+-------------------------------------------------------
 {{{
   const uint8_t *cp, *end;
 ...
   for (cp = cell->payload; cp+1 < end; ++cp) {
     uint16_t v = ntohs(get_uint16(cp));
 }}}

 So we count the payload one byte at a time, considering that byte plus the
 one after it?

 {{{
 The payload in a VERSIONS cell is a series of big-endian two-byte
    integers.
 }}}

 That probably produces some weird behavior. Marking as 0.2.3 since I'm not
 sure yet what weird behavior.

 Reported by bob from irc.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8059>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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