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Avoid overflow in the initial 'nextExchangeTransitionConfTime' calculation (#3809)

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zah 2022-06-28 23:50:40 +03:00 committed by GitHub
parent ff12c7f9ce
commit 2c3e47d7e6
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2 changed files with 12 additions and 4 deletions
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14
beacon_chain/nimbus_beacon_node.nim
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@ -724,11 +724,19 @@ proc init*(T: type BeaconNode,
else:
nil
bellatrixEpochTime =
genesisTime + cfg.BELLATRIX_FORK_EPOCH * SLOTS_PER_EPOCH * SECONDS_PER_SLOT
maxSecondsInMomentType = Moment.high.epochSeconds
# If the Bellatrix epoch is above this value, the calculation
# below will overflow. This happens in practice for networks
# where the `BELLATRIX_FORK_EPOCH` is not yet specified.
maxSupportedBellatrixEpoch = (maxSecondsInMomentType.uint64 - genesisTime) div
(SLOTS_PER_EPOCH * SECONDS_PER_SLOT)
bellatrixEpochTime = if cfg.BELLATRIX_FORK_EPOCH < maxSupportedBellatrixEpoch:
int64(genesisTime + cfg.BELLATRIX_FORK_EPOCH * SLOTS_PER_EPOCH * SECONDS_PER_SLOT)
else:
maxSecondsInMomentType
nextExchangeTransitionConfTime =
max(Moment.init(int64 bellatrixEpochTime, Second),
max(Moment.init(bellatrixEpochTime, Second),
Moment.now)
let node = BeaconNode(

2
vendor/nim-chronos vendored

@ -1 +1 @@
Subproject commit c6ce4d4fb26a785aabff84793fcd2b86a0ff93af
Subproject commit 84e32a3b695b2e54ff7733ca660bd95332b21d38