Christmas Dinner

Summary

The lack of validation for _amount can lead to several practical and security issues in the deposit function.

Impact

• Wasteful Operation: The function will execute unnecessary state changes, such as updating the balances mapping and emitting event.

  • Gas will be consumed for this redundant operations, unnecessarily increasing transaction costs for users.

• Confusion In Events:
  when _amount = events like GenerousAdditionalContribution or NewSignup will still be emitted.
  this might confuse user or developers interpreting the logs, as the deposit amount is effectively 0.

• Logical Inconsistencies:

  • A deposit of zero tokens do not logically qualify as a "deposit" or "signUp".

  • Allowing such case undermines the purpose of the function, which is to register meaningful contributions.

Tools Used

Manual review

Recommendations

Add a validation check at the start of the function to ensure _amount > 0