Submission Details
Severity:
`HorseStore.huff::TOTAL_SUPPLY` never increases, breaking the protocol.
Description
The HorseStore.huff::TOTAL_SUPPLY forgets to increase after the execution of the _MINT macro. Since the total supply is managed by the user (without utilizing a library like ERC721Enumeration), the contract needs to autonomously increment the value.
#define macro MINT_HORSE() = takes (0) returns (0) {
[TOTAL_SUPPLY] // [TOTAL_SUPPLY]
sload // added in another finding to actually use the real value for _MINT
caller // [msg.sender, totalSupply]
@> _MINT() // []
@>
stop // []
}
Impact
The consequence is the impossibility to mint more than one horse.
Proof of Concept
Foundry PoC
function testTotalSupplyDontIncrease() public {
uint id = horseStore.totalSupply();
vm.startPrank(user);
horseStore.mintHorse();
// will fail because totalSupply() returns 0
assertEq(horseStore.totalSupply(), id+1);
vm.stopPrank();
}
Recommended Mitigation
To resolve this issue, increment the totalSupply after _MINT. Here is a suggested example:
#define macro MINT_HORSE() = takes (0) returns (0) {
[TOTAL_SUPPLY] // [TOTAL_SUPPLY]
sload // added in another finding to actually use the real value for _MINT
caller // [msg.sender, totalSupply]
_MINT() // []
+ [TOTAL_SUPPLY] // [TOTAL_SUPPLY]
+ sload // [totalSupply]
+ 0x01 add // [totalSupply+1]
+ [TOTAL_SUPPLY] // [TOTAL_SUPPLY, totalSupply]
+ sstore
stop // []
}
Updates
Lead Judging Commences
inallhonesty almost 2 years ago
Submission Judgement Published Assigned finding tags:
Failure to increment total supply on mint
Failure to properly load the totalSupply in Huff
n0kto
almost 2 years ago
n0kto
almost 2 years ago
inallhonesty
almost 2 years ago
n0kto
almost 2 years ago
inallhonesty almost 2 years ago
Submission Judgement Published Assigned finding tags:
Failure to increment total supply on mint
Failure to properly load the totalSupply in Huff
Rewards breakdown
nSLOC
460This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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