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  1. Core Server
  2. SERVER-39490

opWriteConcernCounters can cause undefined behavior due to overflow

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 3.6.11, 4.0.6, 4.1.7
    • Fix Version/s: 3.6.12, 4.0.7, 4.1.9
    • Component/s: Replication
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      ALL
    • Backport Requested:
      v4.0, v3.6
    • Sprint:
      Repl 2019-03-11

      Description

      The counters in ServerWriteConcernMetrics can overflow, since they are signed integers, and they are not protected by std::atomic. We should make these counters unsigned (preferably std::uint64_t). In order to append them to a BSONObj here, we can cast them to long long.

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              • Created:
                Updated:
                Resolved: