[tor-bugs] #15515 [Tor]: Don't allow multiple INTRODUCE1s on the same circuit

[Tor Bug Tracker & Wiki]

#15515: Don't allow multiple INTRODUCE1s on the same circuit
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     Reporter:  asn      |      Owner:
         Type:  defect   |     Status:  needs_review
     Priority:  normal   |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  026-backport 025-backport
Actual Points:           |  024-backport
       Points:           |  Parent ID:  #15463
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Comment (by cypherpunks):

 Why it counts already_received_introduce1 if NACK only will be sent? Look
 at code of client, if all IP expired after received NACK, it keeps circuit
 alive and going to refetch the service descriptor to reuse intro circuit
 again next time for data from new descriptor for a same hs or another?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15515#comment:14>
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