Submitted by WatchPug
https://github.com/code-423n4/2022-01-timeswap/blob/bf50d2a8bb93a5571f35f96bd74af54d9c92a210/Timeswap/Timeswap-V1-Convenience/contracts/libraries/BorrowMath.sol#L19-L53
This issue is similar to the two previous issues related to state.y manipulation. Unlike the other two issues, this function is not on TimeswapPair.sol but on TimeswapConvenience.sol, therefore this can not be solved by adding onlyConvenience modifier.
Actually, we believe that it does not make sense for the caller to specify the interest they want to pay, we recommend removing this function.
LendMath.check(): https://github.com/code-423n4/2022-01-timeswap/blob/bf50d2a8bb93a5571f35f96bd74af54d9c92a210/Timeswap/Timeswap-V1-Core/contracts/libraries/LendMath.sol#L28-L28
BorrowMath.check(): https://github.com/code-423n4/2022-01-timeswap/blob/bf50d2a8bb93a5571f35f96bd74af54d9c92a210/Timeswap/Timeswap-V1-Core/contracts/libraries/BorrowMath.sol#L31-L31
Mathepreneur (Timeswap) confirmed
