Submission Details
Severity:
Making a call twice is unnecessary
Summary
The external function is being called twice, although a single call would suffice.
Vulnerability Details
In resolveDispute(), balanceOf() is called twice. However, one call is sufficient. Instead of the second balanceOf() call, you can just subtract totalFee from the tokenBalance. Doing arithmetic operations costs significantly less gas than doing external calls.
File: 2023-07-escrow/src/Escrow.sol
125: tokenBalance = i_tokenContract.balanceOf(address(this));
Function gas savings:
| Function Name | min | avg | median | max | # calls |
|---|---|---|---|---|---|
| resolveDispute | 383 | 27017 | 22342 | 62460 | 8 |
| resolveDisputeOptimized | 377 | 26622 | 21946 | 61683 | 8 |
Deployment gas savings:
| Contract Name | Deployment Cost | Deployment Size |
|---|---|---|
| Escrow | 591900 | 3666 |
| EscrowOptimized | 577888 | 3596 |
| EscrowFactory.sol | 1720616 | 8622 |
| EscrowFactoryOptimized.sol | 1692588 | 8482 |
Impact
Gas Optimization
Tools Used
Manual review.
Recommendations
File: 2023-07-escrow/src/Escrow.sol
- tokenBalance = i_tokenContract.balanceOf(address(this));
+ tokenBalance = tokenBalance - totalFee;
Prize pool breakdown
Total prize
40,000 USDC
nSLOC
186215
USDC / LOC
37,000 USDC
3,000 USDC
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