free()释放了内存为什么还能使用

Question

#include <stdlib.h>
#include <malloc.h>

typedef struct haha {
    int a ;
    long b;
} haha;

int main()
{
    haha **yes = malloc(sizeof(haha *)* 2);

    haha *one = malloc(sizeof(haha)); 
    haha *two = malloc(sizeof(haha));
    one->a = 1;
    one->b = 100;

    two->a = 2;
    two->b = 200;

    yes[0] = one;
    yes[1] = two;

    free(one);
    free(two);

    yes[0]->a= 3;
    yes[1]->a = 4;


}

为什么最后还句不报错?按理来说释放了内存应该不能使用的

Answer 1

这就像你把钱包扔在垃圾桶，五分钟之后你或许还可以找得着，五小时后可能是空瓶子了