passcode_writeup(pwnable.kr_passcode)scanf函数不加”&”带来的危险

#include <stdlib.h>

void (){
    int passcode1;
    int passcode2;

    printf("enter passcode1 : ");
    scanf("%d", passcode1);
    fflush(stdin);
    
    
    printf("enter passcode2 : ");
        scanf("%d", passcode2);
    
    printf("checking...n");
    if(passcode1==338150 && passcode2==13371337){
                printf("Login OK!n");
                system("/bin/cat flag");
        }
        else{
                printf("Login Failed!n");
        exit(0);
        }
}

void welcome(){
    char name[100];
    printf("enter you name : ");
    scanf("%100s", name);
    printf("Welcome %s!n", name);
}

int main(){
    printf("Toddler's Secure Login System 1.0 beta.n");

    welcome();
    login();
    
    // something after login...
    printf("Now I can safely trust you that you have credential :)n");
    return 0;   
}