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29267 - [SC - High] Wrong implementation causing some functions in ....md

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Wrong implementation causing some functions in governance/contracts/voter/PoolVoter.sol unusable.

Submitted on Mar 12th 2024 at 18:54:46 UTC by @EricTee for Boost | ZeroLend

Report ID: #29267

Report type: Smart Contract

Report severity: High

Target: https://github.com/zerolend/governance

Impacts:

  • Unusable functions in governance/contracts/voter/PoolVoter.sol

Description

Brief/Intro

Some functions in governance/contracts/voter/PoolVoter.sol are unusable. Specifically, there is no setter for isPool variable to set certain address asset to true or false. As a result, the length of _pools will always be 0. PoolVoter::distribute and PoolVoter::distributeEx functions which rely on length of pool will become unusable.

Vulnerability Details

In PoolVoter::registerGauge:

  function registerGauge(
        address _asset,
        address _gauge
    ) external onlyOwner returns (address) {
        if (isPool[_asset]) {
            _pools.push(_asset);
            isPool[_asset] = true;
        }

        bribes[_gauge] = address(0);
        gauges[_asset] = _gauge;
        poolForGauge[_gauge] = _asset;
        _updateFor(_gauge);

        return _gauge;
    }

The contract check for if (isPool[_asset]). However, there is no setter to let owner set certain _asset to true in isPool mapping variable. As a result, the length of pool will always be 0 and PoolVoter::distribute and PoolVoter::distributeEx functions which rely on length of pool will become unusable.

Impact Details

The impact of this issue is that PoolVoter::distribute and PoolVoter::distributeEx functions which rely on length of pool are unusable.

Consider making the following changes in PoolVoter::registerGauge:

    function registerGauge(
        address _asset,
        address _gauge
    ) external onlyOwner returns (address) {
--        if (isPool[_asset]) {
++        if (!isPool[_asset]) {
            _pools.push(_asset);
            isPool[_asset] = true;
        }

        bribes[_gauge] = address(0);
        gauges[_asset] = _gauge;
        poolForGauge[_gauge] = _asset;
        _updateFor(_gauge);

        return _gauge;
    }

References

https://github.com/zerolend/governance/blob/main/contracts/voter/PoolVoter.sol#L136

Proof of Concept

Manual Analysis