[tor-bugs] #25122 [Core Tor/Tor]: geoip: Hook the client geoip cache into the OOM handler

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#25122: geoip: Hook the client geoip cache into the OOM handler
-------------------------------------------------+-------------------------
 Reporter:  dgoulet                              |          Owner:  dgoulet
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, tor-oom, tor-dos,         |  Actual Points:
  029-backport, 031-backport, 032-backport       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by nickm):

 Looks good.  But could you take a few minutes to make sure that there is
 nowhere else in all the codebase, before or after applying #24902, that
 allocates or frees one of these objects?  And that the transport_name
 field never changes once the object is allocated?

 Possibly, we should make a _new() function to handle the allocate-and-
 count part of this function.  That could be a separate ticket, though.

 Possibly, we should check to make sure that we never underflow on
 geoip_client_history_cache_size

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25122#comment:4>
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