c - 为什么我会收到此错误以及如何修复它 : munmap_chunk(): invalid pointer: 0x0000000000400694 *** Hello WorldAborted

Question

我写了下面的程序:

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
        char *s;
        s = (char*)malloc(15);
        s = "Hello World";
        printf("%s",s);
        free(s);
        return 0;
  }

没有编译错误。 我收到此运行时错误: * `./s' 中的错误:munmap_chunk():无效指针:0x0000000000400694 * Hello WorldAborted

为什么会出现此运行时错误，我该如何解决？ 是不是因为调用malloc后，s收到了某个地址，赋值s = "Hello World"修改了的地址code>s，但是当执行 free(s) 时，发送到 free 的指针不是 malloc 返回的指针?

Answer 1

Is it because after the call to malloc, s received a certain address, and the assignment s = "Hello World" modifies the address of s, but then when doing free(s), the pointer that is sent to free is not the one that was returned by malloc?

是

    s = (char*)malloc(15);
    s = "Hello World";

您正在覆盖 malloc 的返回地址(内存泄漏)

free()

if the argument does not match a pointer earlier returned by the calloc(), malloc(), posix_memalign(), realloc(), or strdup() function, or if the space has been deallocated by a call to free() or realloc(), the behavior is undefined.

将 s = "Hello World"; 更改为 strcpy(s, "Hello world");

另外，看看 Do I cast the result of malloc?