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free(): double free detected in tcache 2 Aborted (core dumped)

Bugs Founder answered on July 23, 2022 Popularity 6/10 Helpfulness 1/10

answer free(): double free detected in tcache 2 Aborted (core dumped)

free(): double free detected in tcache 2 Aborted (core dumped)

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#include <stdlib.h>
int readFields(char* user, int* h, int* m)
{
    user = calloc(21, sizeof(char));
    return scanf("%21s,%d,%d", user, h, m);
//    free(user); // should I free the memory here or in main?
}
int main(int argc, char *argv[])
{
    char *user = NULL;
    user = calloc(21, sizeof(char)); // do I have to dynamically allocate memory in both main and readFields?
    int hh , mm;
    if(argc != 2)
    {
        printf("Invalid format.\n");
        return -1;
    }
    FILE *file_to_read = fopen(argv[1], "r");
    if(!file_to_read)
    {
        printf("ERROR reading the file.\n");
        return 1;
    }
    if(readFields(user, &hh, &mm)==3)
    {
        printf("The first login was made by %s at %d:%d.\n", user, hh, mm);
    }
    else
        {
            printf("Invalid format.\n");
        }
    free(user);
    fclose(file_to_read);
    if(fclose(file_to_read) != 0)
    {
        printf("Error closing file.\n");
        return -1;
    }
   return 0;
}

Popularity 6/10 Helpfulness 1/10 Language whatever

Source: cboard.cprogramming.com

Tags: double-free whatever

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