[tor-bugs] #33290 [Core Tor/Tor]: Add diagnostics for confusing corruption issue #32564 in ewma

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#33290: Add diagnostics for confusing corruption issue #32564 in ewma
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.2.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.4.1.6
 Severity:  Normal                               |     Resolution:
 Keywords:  043-should 041-backport              |  Actual Points:  .1
  042-backport                                   |
Parent ID:  #32564                               |         Points:
 Reviewer:  dgoulet                              |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by nickm):

 Coverity has spotted the error in this line:
 {{{
     memwipe(hashent, 0xef, sizeof(*hashent));
 }}}

 I'm applying the fix to the ticket33290_v2_{041,042,043,master} branches
 and merging it to 043.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33290#comment:10>
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