c - 堆损坏检测到 C 中的内存泄漏

Question

我得到了错误提示

Debug assertation failed and heat corruption detected

好像我的程序中的一切都运行良好，但我收到了那个错误。这里的内存泄漏在哪里？我必须释放 main 中的内存，因为我的函数需要返回指针。

我的代码:

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

int *dynamic_reader(unsigned int n) {

    /*making new array and checking if allocation succeeded*/
    int *mem;
    mem = malloc(n * sizeof(int));
    if (!mem) {
        printf("Memory allocation failed\n");
        exit(-1);
    }

    /*letting the user to input the values for the array*/
    int i = 0;
    while (i < n) {
        scanf("\n%d", &mem[i]);
        i++;
    }

    /*printing the array just to make sure everything is good*/
    for (int j = 0; j < n; j++) {
        printf("%d  ", mem[j]);
    }

    return mem;
}
int *insert_into_array(int *arr, unsigned int num, int newval) {

    /*making new bigger array*/
    int *newarr = realloc(arr, (num + 1) * sizeof(int));

    /*adding the integer to this new array */
    newarr[num] = newval;
    printf("\n");

    /*printing to make sure everything is correct*/
    for (int j = 0; j < num + 1; j++) {
        printf("%d  ", newarr[j]);
    }
    return newarr;
}
int main(void) {
    /*In dynamic_reader function I need to make an array which size is given as a parameter*/
    /*In this case I choosed 3*/
    int *arr = dynamic_reader(3);
    int num = 3;
    /*In insert_into_array function I need to add one integer to this array I made in dynamic_reader*/
    /*The parameters are the array, the number of elements in the array already done and the integer I want to add*/
    int *c = insert_into_array(arr, num, 9);

    /*I free the memory here because I need to return the pointers of these arrays in the function so it cant be done there*/
    free(arr);
    free(c);
}

Answer 1

你正在双重释放你的内存。查看 realloc 的文档. Realloc 将 1) 扩展传递的缓冲区或 2) 分配一个新缓冲区、复制数据并释放原始缓冲区。当你这样做时:

free(arr);
free(c);

您正在双重释放一个已经被 realloc 释放或已经被第一个 free(arr)

释放的值

此外，您应该检查 realloc 是否失败(返回 NULL)，如果失败，请适当处理。