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[Merged by Bors] - Check whistle-blower index #1911

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[Merged by Bors] - Check whistle-blower index #1911

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7 changes: 7 additions & 0 deletions consensus/state_processing/src/common/slash_validator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,13 @@ pub fn slash_validator<T: EthSpec>(
validator_effective_balance.safe_div(spec.whistleblower_reward_quotient)?;
let proposer_reward = whistleblower_reward.safe_div(spec.proposer_reward_quotient)?;

// Ensure the whistleblower index is in the validator registry.
if state.validators.get(whistleblower_index).is_none() {
return Err(BeaconStateError::UnknownValidator(
whistleblower_index as u64,
));
}

increase_balance(state, proposer_index, proposer_reward)?;
increase_balance(
state,
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