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Elegant Carbon Nightingale

Medium

Gas Limit exceeded due to Unbounded Array in HatsSignerGate::_removeSigner

Summary

Iterating over an unbounded array in the HatsSignerGate::_removeSigner function can cause the function to fail.

Root Cause

The HatsSignerGate::_removeSigner function calls SafeManagerLib::findPrevOwner to identify the previous signer of the signer to be removed. However, the _owners array parameter is unbounded. If the array is too large, this iteration may exceed the gas limit, causing the transaction to revert.

HatsSignerGate::_removeSigner function:

function _removeSigner(address _signer) internal {
  ...
  if (owners.length == 1) {
    removeOwnerData = SafeManagerLib.encodeSwapOwnerAction(SafeManagerLib.SENTINELS, _signer, address(this));
  } else {
    uint256 newThreshold = _getNewThreshold(owners.length - 1);
=>  removeOwnerData = SafeManagerLib.encodeRemoveOwnerAction(SafeManagerLib.findPrevOwner(owners, _signer), _signer, newThreshold);
  }
  s.execSafeTransactionFromHSG(removeOwnerData);
}

Impact

Failure of the HatsSignerGate::_removeSigner function results in the inability to remove signers