Vulnerability Details:

The mulWadUp function is designed to perform multiplication and subsequent rounding up of the result by adding 1 if needed. While the function includes overflow checks, it does not employ the SafeMath library for multiplication operations. Using SafeMath for arithmetic operations enhances safety and readability, reducing the risk of overflow-related vulnerabilities.

Issue arises from the absence of SafeMath, which is a library commonly used in Solidity to mitigate the risk of arithmetic overflow and underflow. Without SafeMath, the multiplication operation in mulWadUp may be susceptible to overflow, which occurs when the result exceeds the maximum representable value for a uint256.

Impact:

Potential overflow vulnerabilities can have severe consequences, leading to unexpected behavior or vulnerabilities in smart contracts. In the context of mulWadUp, an overflow during the multiplication step may result in an incorrect calculation of the final rounded-up value. This miscalculation could lead to unexpected results in financial or token-related operations, impacting the integrity of the contract.

Tools Used:

Based on manual code review and knowledge of best practices in Solidity development.

Recommendations:

To enhance safety and readability, recommended to replace the multiplication operation in mulWadUp with the SafeMath library. SafeMath ensures that arithmetic operations are performed securely, guarding against overflows and underflows. Below is the updated code snippet using SafeMath for the multiplication operation:

By incorporating SafeMath, this updated code reduces the risk of potential overflow vulnerabilities during the multiplication operation, contributing to a more robust and secure implementation.