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program: Use saturating math for reserve accounting #721

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program: Use saturating math for reserve accounting #721

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5 changes: 3 additions & 2 deletions program/src/processor.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2218,10 +2218,11 @@ impl Processor {
let previous_pool_token_supply = stake_pool.pool_token_supply;
let reserve_rent = rent.minimum_balance(reserve_stake_info.data_len());

// Use `saturating_sub` here in case rent goes up and the reserve doesn't
// have enough lamports to cover rent.
let mut total_lamports = reserve_stake_info
.lamports()
.checked_sub(minimum_reserve_lamports(reserve_rent))
.ok_or(StakePoolError::CalculationFailure)?;
.saturating_sub(minimum_reserve_lamports(reserve_rent));

for validator_stake_record in validator_list
.deserialize_slice::<ValidatorStakeInfo>(0, validator_list.len() as usize)?
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