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Audit Fix #285 - Cycle payment should never exceed cycle payment amt #42

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Audit Fix #285 - Cycle payment should never exceed cycle payment amt #42

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afe9c9b
add
ethereumdegen May 15, 2024
8ac0e10
remove interst dbl count
ethereumdegen Jun 13, 2024
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20 changes: 14 additions & 6 deletions packages/contracts/contracts/libraries/V2Calculations.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -86,13 +86,18 @@ library V2Calculations {
_bid.loanDetails.principal -
_bid.loanDetails.totalRepaid.principal;

uint256 daysInYear = _paymentCycleType == PaymentCycleType.Monthly
uint256 owedTime = _timestamp - uint256(_lastRepaidTimestamp);

{
uint256 daysInYear = _paymentCycleType == PaymentCycleType.Monthly
? 360 days
: 365 days;

uint256 interestOwedInAYear = owedPrincipal_.percent(_bid.terms.APR);
uint256 owedTime = _timestamp - uint256(_lastRepaidTimestamp);
interest_ = (interestOwedInAYear * owedTime) / daysInYear;
uint256 interestOwedInAYear = owedPrincipal_.percent(_bid.terms.APR);

interest_ = (interestOwedInAYear * owedTime) / daysInYear;
}


bool isLastPaymentCycle;
{
Expand Down Expand Up @@ -121,10 +126,13 @@ library V2Calculations {
// Max payable amount in a cycle
// NOTE: the last cycle could have less than the calculated payment amount

//the amount owed for the cycle should never exceed the current payment cycle amount so we use min here
uint256 owedAmountForCycle = Math.min( ((_bid.terms.paymentCycleAmount * owedTime) ) /
_paymentCycleDuration , _bid.terms.paymentCycleAmount+interest_ ) ;

uint256 owedAmount = isLastPaymentCycle
? owedPrincipal_ + interest_
: (_bid.terms.paymentCycleAmount * owedTime) /
_paymentCycleDuration;
: owedAmountForCycle ;

duePrincipal_ = Math.min(owedAmount - interest_, owedPrincipal_);
}
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