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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 Zahary Karadjov
parent 725b120bc3
commit fa7d7fcc42
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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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@ -712,11 +712,19 @@ proc init*(T: type BeaconNode,
else: else:
nil nil
bellatrixEpochTime = maxSecondsInMomentType = Moment.high.epochSeconds
genesisTime + cfg.BELLATRIX_FORK_EPOCH * SLOTS_PER_EPOCH * SECONDS_PER_SLOT # 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 = nextExchangeTransitionConfTime =
max(Moment.init(int64 bellatrixEpochTime, Second), max(Moment.init(bellatrixEpochTime, Second),
Moment.now) Moment.now)
let node = BeaconNode( let node = BeaconNode(

2
vendor/nim-chronos vendored

@ -1 +1 @@
Subproject commit 2a5095505f771610f9559d2e774b2a9561f01101 Subproject commit a5bc5ca996ab72c1c5dda7d5b922b536f39f603e