Platform: Code4rena
Start Date: 14/07/2022
Pot Size: $25,000 USDC
Total HM: 2
Participants: 63
Period: 3 days
Judge: PierrickGT
Total Solo HM: 1
Id: 147
League: ETH
Rank: 13/63
Findings: 2
Award: $72.07
🌟 Selected for report: 0
🚀 Solo Findings: 0
🌟 Selected for report: hickuphh3
Also found by: 0x29A, 0x52, 0xNazgul, Chom, Deivitto, ElKu, Funen, IllIllI, Meera, ReyAdmirado, SooYa, TomJ, Trumpero, Waze, __141345__, ak1, asutorufos, c3phas, cRat1st0s, csanuragjain, delfin454000, exd0tpy, fatherOfBlocks, hake, hansfriese, horsefacts, hyh, karanctf, kenzo, kyteg, ladboy233, pashov, peritoflores, rajatbeladiya, rbserver, reassor, rokinot, simon135, wastewa
54.9162 USDC - $54.92
https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L71 https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L176 https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L288 https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L346
otherWitches can be change to witches only ( as sponsor wants name suggestions )#0 - alcueca
2022-07-22T14:01:18Z
🌟 Selected for report: IllIllI
Also found by: 0x1f8b, 0x29A, 0xKitsune, 0xNazgul, Aymen0909, Chom, Deivitto, ElKu, JC, JohnSmith, Kaiziron, Limbooo, MadWookie, Meera, ReyAdmirado, Rohan16, Sm4rty, SooYa, TomJ, Trumpero, Waze, __141345__, ajtra, ak1, antonttc, bulej93, c3phas, cRat1st0s, csanuragjain, defsec, durianSausage, fatherOfBlocks, gogo, hake, hickuphh3, ignacio, joestakey, karanctf, kyteg, m_Rassska, pashov, rajatbeladiya, rbserver, robee, rokinot, samruna, sashik_eth, simon135, tofunmi
17.1544 USDC - $17.15
The EVM only operates on 32 bytes/ 256 bits at a time. This means that if you use uint8, EVM has to first convert it uint256 to work on it and the conversion costs extra gas! In solidity, you can pack multiple small variables into one slot, but if you are defining a lone variable and can’t pack it, it’s optimal to use a uint256 rather than uint8.
e.g. variable packing
uint8 variable1; uint8 variable2; uint256 variable3;
https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L63 https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L129 https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L241
https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L162-L164 https://github.com/code-423n4/2022-07-yield/blob/6ab092b8c10e4dabb470918ae15c6451c861655f/contracts/Witch.sol#L189
memory instead of storage