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[tor-bugs] #30920 [Core Tor/Tor]: Detect uint64 overflow in config_parse_units()

#30920: Detect uint64 overflow in config_parse_units()
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Low           |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Minor         |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 The config_parse_units function uses 64-bit arithmetic, but does not
 detect 64-bit overflow.  This means that values like "20000000 TB", which
 should be rejected, are instead mis-parsed.

 Since this function is only used for configuration parsing, it's not a
 huge issue, but it should be simple enough to resolve this.

 Found while working on 30893.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30920>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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