Submission Details
Severity:
There is a mistake in the computation of variable.
Summary
There is a computation mistake in the variable function.
Vulnerability Details
uint256 diff = data[i] - mean;
Impact
When calls the variable function, always revert underflow Error of uint256.
Because mean is bigger than some data[i].
Tools Used
Manual
function variance(uint256[] memory data) internal pure returns (uint256 ans, uint256 mean) {
mean = avg(data);
uint256 sum = 0;
for (uint256 i = 0; i < data.length; i++) {
- uint256 diff = data[i] - mean;
+ uint256 diff = data[i] > mean ? data[i] - mean : mean - data[i];
sum += diff * diff;
}
ans = sum / data.length;
}
Updates
Lead Judging Commences
inallhonesty
8 months ago
inallhonesty 8 months ago
Submission Judgement Published Assigned finding tags:
Underflow in computing variance
Prize pool breakdown
Total prize
21,000 USDC
nSLOC
1,03420 USDC / LOC
20,000 USDC
1,000 USDC
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