[tor-bugs] #31413 [Core Tor/Tor]: Check for null IPv6 addresses/extends in circuit_extend()

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#31413: Check for null IPv6 addresses/extends in circuit_extend()
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     Reporter:  neel          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  ipv6, tor-relay
Actual Points:                |  Parent ID:  #24403
       Points:                |   Reviewer:
      Sponsor:                |
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 In teor's comment in #31088:

 > You've added some code that isn't needed yet. Please reject all IPv6
 extends in this patch, and open a separate child ticket of #24403 for
 allowing IPv6 extends.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31413>
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