I was reading a paper and saw this piece of code has information leakage vulnerability. It was saying the following code will Leak memory layout information to the attackers

Could somebody please explain me how will it leak information?

struct userInfo{
    char username[16];
    void* (*printName)(char*);
} user;
...
user.printName = publicFunction.
...
n = attacker_controllable_value; //20
memcpy(buf, user.username, n);   //get function ptr
SendToServer(buf);

I can see memcpy will give exception but why should it return memory address to attacker(or whatever it is returning)?

Thanks in advance

I was reading a paper and saw this piece of code has an information leakage vulnerability. It was saying the following code will Leak memory layout information to the attackers

Could somebody please explain me how this leaks information?

struct userInfo{
    char username[16];
    void* (*printName)(char*);
} user;
...
user.printName = publicFunction.
...
n = attacker_controllable_value; //20
memcpy(buf, user.username, n);   //get function ptr
SendToServer(buf);

I can see memcpy will give exception but why should it return memory address to attacker(or whatever it is returning)?

Thanks in advance