Tadle

Summary

The TokenManager::updateTokenWhiteListed function lacks proper input validation and emits an excessive number of events. It doesn't check for zero-address tokens or duplicate addresses in the input array, which could lead to unnecessary gas consumption and potential logical errors.

Additionally, the function emits an event for each token update, which could result in an excessive number of event emissions for large arrays.

Vulnerability Details

In this function:

• There's no check for zero addresses in the _tokens array.

• There's no check for duplicate addresses.

• An event is emitted for each token update, regardless of the array size.

Impact

• Unnecessary gas consumption due to processing invalid or duplicate addresses.

• Potential logical errors in the contract's state if zero addresses are whitelisted.

• Excessive gas costs and blockchain bloat due to emitting an event for each token update, especially for large arrays.

• Reduced efficiency of off-chain monitoring systems due to an unnecessarily large number of events.

Tools Used

Manual Review

Recommendations

1. Implement input validation:

   1. Add a check for zero addresses.

   2. Consider adding a check for duplicate addresses (if that's a concern for the business logic).

2. Optimize event emission:

   1. Emit a single event for the entire batch update instead of individual events.

This revised version includes input validation and emits a single event for the entire batch, significantly reducing gas costs and improving efficiency.