[tor-bugs] #31482 [Core Tor/Tor]: Avoid possible overflow when converting between coarse stamp to approx ms

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#31482: Avoid possible overflow when converting between coarse stamp to approx ms
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.2.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.4.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  035-backport, 040-backport,          |  Actual Points:  0.5
  041-backport, 042-should                       |
Parent ID:                                       |         Points:  1
 Reviewer:  nickm                                |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 macOS fails with:
 {{{
 util/monotonic_time:
   FAIL src/test/test_util.c:6211: assert(rep_units OP_EQ units): 9534 vs
 9536
   [monotonic_time FAILED]
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31482#comment:7>
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