I need to know why this code has and flaw and what that flaw is. Thank you and thumbs up.

HW1c 1. Identify the problem(s) in the following code: void func(int fd) { char "buf; size_t len; read(fd, &len, sizeof(len)); buf = malloc(len + 1); read(fd, buf, len); buf[len] = '\0'; } 2. What is the main issue with the above code? 3. Implement a defensive, secure solution