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Fix an overflow in the justification bits processing

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Zahary Karadjov 2019-09-27 19:40:33 +03:00 committed by zah
parent 5a1a878bbd
commit c39d4f1817
1 changed files with 5 additions and 1 deletions
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6
beacon_chain/spec/state_transition_epoch.nim
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@ -200,7 +200,11 @@ proc process_justification_and_finalization*(
## Spec:
## state.justification_bits[1:] = state.justification_bits[:-1]
## state.justification_bits[0] = 0b0
state.justification_bits = state.justification_bits shl 1
# TODO JUSTIFICATION_BITS_LENGTH is a constant in spec, move there or fix
# BitVector serialization in SSZ layer
const JUSTIFICATION_BITS_LENGTH = 4
state.justification_bits = (state.justification_bits shl 1) and
cast[uint8]((2^JUSTIFICATION_BITS_LENGTH) - 1)
# This is a somewhat expensive approach
let active_validator_indices =