[tor-bugs] #21372 [Core Tor/Tor]: Don't crash when we fail to find extend info for a middle node

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#21372: Don't crash when we fail to find extend info for a middle node
------------------------------+------------------------------------
 Reporter:  teor              |          Owner:  nickm
     Type:  defect            |         Status:  needs_revision
 Priority:  Medium            |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor      |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:  crash-resistance  |  Actual Points:
Parent ID:                    |         Points:  0.2
 Reviewer:                    |        Sponsor:
------------------------------+------------------------------------
Changes (by dgoulet):

 * status:  needs_review => needs_revision


Comment:

 Changes file has `bugfix on 0.3.1-alpha.` which I think you might have
 meant `0.3.0.1-alpha`?

 I think there might be another assert possibility here in the case
 `first_node` is NULL ?

 {{{
 ./src/or/control.c +3379   extend_info_t *info =
 extend_info_from_node(node, first_node);
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21372#comment:4>
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