buffer overflow vulnerability in the libmodbus library

to modify python file to exploit device that suffers from the buffer overflow vulnerability in the libmodbus library. The vulnerability can be found in the modbus reply function and is exploited by the remote write/read requests. In this function, rsp is a buffer which was defined in the stack. This buffer is used when the server tries to read/write from/to the registers (see the modbus reply function in modbus.c file). Since the number of requested registers is not checked in this function, rsp can be overwritten. This is exactly the main vulnerability of the modbus reply function.