Summary

Due to the naming order of the addresses in the input variable and as a result the possibility of error in the order of sending the addresses may cause an error in retrieving the sender's address.

Vulnerability Details

The name of the main variable is A, so by default, the function first puts the address of the sender in the input argument and then puts the address of the receiver. Therefore, there is a possibility of calculating the error in getting the address of the sender. On the other hand, it seems that this calculation method does not return the correct address and needs to be re-examined

Impact

Having the wrong address from the sender will cause the entire process to fail

Tools Used

Manual

Recommendations

Change variable nave or the way that function get input variables.
reconsider the way that function calculate sender address .