stack around the variable "xx" was corrupted

今天碰到这个问题，网上查了下时越界，仔细看代码终于发现问题了：

代码是这样的：

FILE *f = fopen(path, "rb");if(f){unsigned short c;fread(&c, sizeof(unsigned short), 2, f);fclose(f);}

运行到这里弹框提示“stack around the variable c was corrupted”

问题的原因是往&c这个地址写入了4个字节，而unsigned short大小是2，显然越界了，把2改成1就好了，当然据说把runtimecheck改成default也可以，但是毕竟不太安全，我用的是Both (/RTC1, equiv. to /RTCsu)