[tor-bugs] #31734 [Core Tor/Tor]: Add accessor functions for cb_buf, which enforce locking and unlocking

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#31734: Add accessor functions for cb_buf, which enforce locking and unlocking
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core     |    Version:  Tor: 0.3.5.1-alpha
  Tor/Tor                |   Keywords:  consider-backport-after-042-stable,
     Severity:  Normal   |  consider-backport-if-needed, diagnostics,
                         |  042-should, 035-backport-maybe, 040-backport-
                         |  maybe, 041-backport-maybe, regression,
                         |  BugSmashFund
Actual Points:           |  Parent ID:  #31614
       Points:           |   Reviewer:
      Sponsor:           |
-------------------------+-------------------------------------------------
 Part of #31614

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31734>
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