编译器提示 '' *** glibc 检测到 *** ./myprog : corrupted double-linked list: 0x0000000001cd6240 *** ''

Question

我有这个功能:

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

typedef struct adress Adress;

struct adress {char *num; char *street; char *namestreet; char *city; char *postal;};

int main(void) {

    int n = 0;

    int i;

    struct adress *Adress;

    FILE *f = fopen("/home/file.txt","r");
    if (!f) {
        printf("Impossible to open file\n");
        return 1;
    }
    char line[256];
    while (fgets(line,256,f)) {
        if (n == 0) {
            Adress = malloc(sizeof(struct adress)*(n+1));
        }
        Adress[n].num = malloc( 256*sizeof( char));

        Adress[n].street = malloc( 256*sizeof( char));

        Adress[n].namestreet = malloc( 256*sizeof( char));

        Adress[n].city = malloc( 256*sizeof( char));

        Adress[n].postal = malloc( 256*sizeof( char));

        fscanf( f , "%s %s %s %s %s", Adress[n].num, Adress[n].street, Adress[n].namestreet, Adress[n].city ,Adress[n].postal);

        n++;  
    }

    for (i = 0; i < n; i++)
    {
        printf("\nNum : %s \n", Adress[i].num);
        printf("\nStreet : %s \n", Adress[i].street);
        printf("\nStreet Name :%s \n", Adress[i].namestreet);
        printf("\nCity :%s \n", Adress[i].city);
        printf("\nPostal Code : %s \n", Adress[i].postal);
    }
    fclose(f);
    return 0;
}

当我尝试编译程序时，出现以下错误:

* glibc detected * ./myprog: corrupted double-linked list: 0x0000000001cd6240

我做错了什么？

以前有人遇到过这种类型的错误吗？

Answer 1

您只为一个struct adress分配足够的空间，如果您读取超过一行，您将写入超出Adress指向的数组末尾并损坏堆。随后对 malloc 的调用会检测到这一点并中止，并显示以下消息:./myprog:损坏的双链表:0x0000000001cd6240。

将地址初始化为NULL:

    struct adress *Adress = NULL;

并更改这三行:

    if (n == 0) {
        Adress = malloc(sizeof(struct adress)*(n+1));
    }

至

    Adress = realloc(Adress, sizeof(struct adress)*(n+1));
    if (!Adress) {
         printf("out of memory\n");
         exit(1);
    }