Platform: Code4rena
Start Date: 07/06/2022
Pot Size: $75,000 USDC
Total HM: 11
Participants: 77
Period: 7 days
Judge: gzeon
Total Solo HM: 7
Id: 124
League: ETH
Rank: 71/77
Findings: 1
Award: $47.43
🌟 Selected for report: 0
🚀 Solo Findings: 0
🌟 Selected for report: IllIllI
Also found by: 0v3rf10w, 0x1f8b, 0x29A, 0xKitsune, 0xNazgul, 0xSolus, 0xf15ers, 0xkatana, 0xmint, 8olidity, Chom, Cityscape, DavidGialdi, Deivitto, ElKu, Fitraldys, Funen, GreyArt, Lambda, Meera, Picodes, PierrickGT, Sm4rty, Tadashi, TerrierLover, TomJ, Tomio, UnusualTurtle, Waze, _Adam, antonttc, asutorufos, berndartmueller, c3phas, catchup, csanuragjain, delfin454000, djxploit, ellahi, fatherOfBlocks, hake, hansfriese, hyh, joestakey, kaden, minhquanym, oyc_109, rfa, sach1r0, saian, samruna, simon135, slywaters, ynnad
47.4309 USDC - $47.43
Use custom errors
Description: Starting from Solidity v0.8.4, there is a convenient and gas-efficient way to explain to users why an operation failed through the use of custom errors. Until now, you could already use strings to give more information about failures (e.g., revert("Insufficient funds.");), but they are rather expensive, especially when it comes to deploy cost, and it is difficult to use dynamic information in them.
Code: https://github.com/code-423n4/2022-06-notional-coop/blob/main/notional-wrapped-fcash/contracts/wfCashBase.sol#L36 https://github.com/code-423n4/2022-06-notional-coop/blob/main/notional-wrapped-fcash/contracts/wfCashERC4626.sol#L23
Mitigation: Define customer ERROR() codes and replace require() with revert ERROR()