Paladin - Warden Pledges contest - Tricko's results

Missing check for votesDifference

There is no check for votesDifference in https://github.com/code-423n4/2022-10-paladin/blob/d6d0c0e57ad80f15e9691086c9c7270d4ccfe0e6/contracts/WardenPledge.sol#L325. If receiver balance of veCRV equals targetVotes this would create a Pledge with zero totalRewardAmount, making this pledge useless as no rational user will pledge without receiving rewards.

    vars.votesDifference = targetVotes - votingEscrow.balanceOf(receiver);

    vars.totalRewardAmount = (rewardPerVote * vars.votesDifference * vars.duration) / UNIT;

Please consider checking vars.votesDifference > 0 and reverting with the appropriate error.

totalDelegatedAmount and rewardAmount calculated incorrectly

The following expression for calculating totalDelegatedAmounts has an extra bias term (https://github.com/code-423n4/2022-10-paladin/blob/d6d0c0e57ad80f15e9691086c9c7270d4ccfe0e6/contracts/WardenPledge.sol#L259-L265), opposed to what is defined in boostV2 contract (https://github.com/curvefi/curve-veBoost/blobdb3dec43b6e4fac0fca1f01509f9133563f43ebb/contracts/BoostV2.vy#L191-L206). Therefore the totalDelegatedAmounts overstates the actual amount pledged per sec, consequently also overstating rewardAmount.

    uint256 totalDelegatedAmount = ((bias * boostDuration) + bias) / 2;

Please consider removing the extra bias term, as shown below.

    uint256 totalDelegatedAmount = (bias * boostDuration) / 2;