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process_attestation: Validate epoch before using it #1996

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Jul 24, 2020
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process_attestation: Validate epoch before using it #1996

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2 changes: 1 addition & 1 deletion specs/phase0/beacon-chain.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1718,10 +1718,10 @@ def process_attester_slashing(state: BeaconState, attester_slashing: AttesterSla
```python
def process_attestation(state: BeaconState, attestation: Attestation) -> None:
data = attestation.data
assert data.index < get_committee_count_per_slot(state, data.target.epoch)
assert data.target.epoch in (get_previous_epoch(state), get_current_epoch(state))
assert data.target.epoch == compute_epoch_at_slot(data.slot)
assert data.slot + MIN_ATTESTATION_INCLUSION_DELAY <= state.slot <= data.slot + SLOTS_PER_EPOCH
assert data.index < get_committee_count_per_slot(state, data.target.epoch)

committee = get_beacon_committee(state, data.slot, data.index)
assert len(attestation.aggregation_bits) == len(committee)
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