The compiler version above 0.8.0 has the ability to control arithmetic overflow/underflow. It is recommended to remove the unwanted code in order to avoid high gas fees.

The addPool function lacks validation for _duration and _emission, allowing pools with 0 duration or rewards. A 0 duration means staking ends instantly, and a 0 emission makes the pool useless, wasting gas and confusing users. This can cause unexpected contract behavior and broken reward calculations. To fix this, add require(_duration > 0, "Duration must be greater than 0") and require(_emission > 0, "Emission must be greater than 0"). This ensures pools are functional, preventing wasted transactions and enhancing contract reliability. Proper validation improves security, usability, and prevents unintended errors in staking pools.

It is recommended to emit all the critical parameter changes.

The updatePool function lacks validation for _pid, allowing invalid pool IDs to cause contract reverts. If _pid exceeds the number of pools, accessing poolInfo[_pid] results in an “index out of bounds” error, disrupting transactions and UI functionality. This can break loops that update multiple pools, leading to wasted gas. To fix this, add require(_pid < poolLength, "Invalid pool ID") before accessing poolInfo. This ensures only valid pools are updated, preventing accidental failures, improving contract stability, and avoiding unnecessary transaction costs. Proper validation enhances security, prevents execution errors, and ensures smooth staking and reward distribution.

Adding a cooldown to updatePool() prevents excessive calls, reducing gas costs and spam attacks. Without it, bots or malicious actors can spam the function, increasing gas fees and network congestion without real benefits. A 10-minute cooldown ensures updates happen at proper intervals, preventing unfair advantage while keeping rewards fair. It also stops redundant updates, making staking more efficient. The cooldown saves gas, improves security, and prevents manipulation by limiting how often rewards are recalculated.

Check that the _amount should be greater than zero.

The deposit function lacks a balance check before transferring rewards, causing transactions to fail and revert if the contract lacks sufficient tokens. This disrupts staking, wastes gas, and prevents users from depositing. To fix this, verify the contract’s balance before sending rewards. This ensures smooth staking even if rewards run low, enhancing contract stability and efficiency.

The compound, withdraw function executes unnecessary steps when pendingReward == 0, leading to wasted gas. Even if there are no rewards, the function updates variables and emits events, consuming gas for no reason. To fix this, add a simple check: if (pendingReward == 0) return; This prevents unneeded executions, reducing gas costs and improving efficiency.

The withdraw function does not check if the contract has enough tokens before transferring the withdrawal amount to the user. If the contract’s balance is lower than the required amount, the transaction fails and reverts, preventing users from withdrawing. This issue occurs when multiple users withdraw simultaneously, draining the contract’s funds. To fix this, check the contract’s balance before transferring.