MyCut

AI First Flight #8
Beginner FriendlyFoundry
EXP
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Submission Details
Impact: low
Likelihood: high
Invalid

`Pot::claimCut` guards with `reward <= 0` on an unsigned integer, a dead/misleading comparison that can only ever mean `== 0`

Severity: L · Impact: L · Likelihood: H

Description

  • claimCut rejects callers with no allocation using if (reward <= 0).

  • reward is a uint256, which can never be negative, so <= 0 is equivalent to == 0. The comparison is misleading (implies a signed value / a "negative reward" case that cannot exist) and wastes a comparison.

// src/Pot.sol:L39-L42
uint256 reward = playersToRewards[player];
@> if (reward <= 0) { // uint256 can never be < 0; this is only ever '== 0'
revert Pot__RewardNotFound();
}

Risk

Likelihood

  • High: the line executes on every claimCut call.

Impact

  • Low / informational: no fund or availability impact — purely code correctness and clarity (a reader may wrongly assume signed semantics).

Proof of Concept

Static: playersToRewards is mapping(address => uint256), so reward is always >= 0; the <= 0 branch is reachable only when reward == 0. There is no input for which <= 0 differs from == 0.

Recommended Mitigation

Use the exact, intent-revealing comparison for an unsigned value.

// src/Pot.sol:L40
- if (reward <= 0) {
+ if (reward == 0) {

Why: == 0 states the actual condition for a uint256 and removes the false implication of a signed/negative case.

Updates

Lead Judging Commences

ai-first-flight-judge Lead Judge about 2 hours ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement

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