TSender

Summary

The current error-handling mechanism in the assembly block stores error codes in memory and then reverts. This is a 2-step process and involves storing an error message or error code first and then using the revert opcode to revert the transaction. This method can be optimized by directly reverting to the error message without storing it first, it can save gas and make it more efficient.

Vulnerability Details

Problematic code

Example of current error handling

Current process-

1. Store Error code: the error code 0xfa10ea06 location 0x00

2. Revert Transaction: The transaction is reverted with the error message starting from memory location 0x1c and length 0x04

This is inefficient as -

1. Storing error code in memory before reverting involves an additional memory operation which consumes extra gas.

2. Directly reverting with an error message avoids the need for intermediate memory storage, thus saving gas.

Impact

Currently, the assembly block stores the error code in memory and then reverts, which is inefficient and consumes more gas fees.

Recommendations

Instead of storing the error code in memory and then reverting, the revert opcode can be used directly with error message.

Example -

1. Direct revert for Transfer Failed Error

2. Direct revert for Zero Address Error

3. Direct revert for Lengths Don't Match Error