не може да освободи памет

gcc 4.4.4 c89

Имам следната функция, но не мога да освободя паметта. Съобщението, което получавам във Valgrind, подозира функцията getline. Въпреки това, аз съм свободен от указателя на файла в края на функцията. Така че не може да бъде така.

Имам глобален масив от указатели към char 'candidate_names'. Въпреки това не съм отделил никаква памет за него.

Много благодаря за всеки съвет,

Съобщението, което получавам във valgrind е следното.

HEAP SUMMARY:
==4021==     in use at exit: 840 bytes in 7 blocks
==4021==   total heap usage: 22 allocs, 15 frees, 1,332 bytes allocated
==4021== 
==4021== Searching for pointers to 7 not-freed blocks
==4021== Checked 48,412 bytes
==4021== 
==4021== 840 bytes in 7 blocks are still reachable in loss record 1 of 1
==4021==    at 0x4005BDC: malloc (vg_replace_malloc.c:195)
==4021==    by 0xAAE38D: getdelim (iogetdelim.c:68)
==4021==    by 0xAAADD2: getline (getline.c:34)
==4021==    by 0x804892B: load_candidates (candidate.c:61)
==4021==    by 0x8048686: main (driver.c:24)

Моят изходен код:

#define NUMBER_OF_CANDIDATES 7
static char *candidate_names[NAME_SIZE] = {0};

int load_candidates()
{
    FILE *fp = NULL;
    size_t i = 0;
    ssize_t read = 0;
    size_t n = 0;
    char *found = NULL;

    fp = fopen("votes.txt", "r");

    /* open the votes file */
    if(fp == NULL) {
        fprintf(stderr, "Cannot open votes file [ %s ]\n", strerror(errno));
        return FALSE;
    }

    /* fill the structure with candidates */
    for(i = 0; i < NUMBER_OF_CANDIDATES; ) {
        read = getline(&candidate_names[i], &n ,fp);
        if(read == -1) {
            fprintf(stderr, "Cannot read candidate [ %d ] [ %s ]\n",
                    i, strerror(errno));
            candidate_names[i] = "Invalid candidate";
            i++;
            continue;
        }
        /* Just ignore the key work in the text file */
        if(strcmp("CANDIDATES\n", candidate_names[i]) != 0) {
            /* Find and remove the carriage return */
            found = strchr(candidate_names[i], '\n');
            if(found != NULL) {
                /* Remove the carriage return by nul terminating */
                *found = '\0';
            }
            i++;
        }
    }

    fclose(fp);

    return TRUE;
}

РЕДАКТИРАНЕ ========= ОСВОБОЖДАВАНЕ на имена на кандидати ======

All heap blocks were freed -- no leaks are possible
==4364== 
==4364== ERROR SUMMARY: 84 errors from 2 contexts (suppressed: 12 from 8)
==4364== 
==4364== 42 errors in context 1 of 2:
==4364== Invalid free() / delete / delete[]
==4364==    at 0x40057F6: free (vg_replace_malloc.c:325)
==4364==    by 0x8048A95: destroy_candidate (candidate.c:107)
==4364==    by 0x8048752: main (driver.c:44)
==4364==  Address 0x401e1b8 is 0 bytes inside a block of size 120 free'd
==4364==    at 0x40057F6: free (vg_replace_malloc.c:325)
==4364==    by 0x8048A95: destroy_candidate (candidate.c:107)
==4364==    by 0x8048752: main (driver.c:44)
==4364== 
==4364== 
==4364== 42 errors in context 2 of 2:
==4364== Invalid read of size 1
==4364==    at 0x400730E: strcmp (mc_replace_strmem.c:426)
==4364==    by 0x8048A7F: destroy_candidate (candidate.c:106)
==4364==    by 0x8048752: main (driver.c:44)
==4364==  Address 0x401e1b8 is 0 bytes inside a block of size 120 free'd
==4364==    at 0x40057F6: free (vg_replace_malloc.c:325)
==4364==    by 0x8048A95: destroy_candidate (candidate.c:107)
==4364==    by 0x8048752: main (driver.c:44)


void destroy_candidate()
{
    size_t i = 0;
    for(i = 0; i < NUMBER_OF_CANDIDATES; i++) {
        if(strcmp(candidate_names[i], "Invalid candidate") != 0) {
            free(candidate_names[i]);
        }
    }
}

РЕДАКТИРАНЕ с код от main.c =====================

typedef struct Candidate_data_t {
    size_t candidate_data_id;
    Candidates_t *candidate;
} Candidate_data;

static Candidate_data* create_candidate_data(Candidates_t *candidate, size_t i);
static void destroy_candidata_data(Candidate_data *cand_data);

int main(void)
{
    Candidates_t *candidate = NULL;
    Candidate_data *cand_data[NUMBER_OF_CANDIDATES] = {0};
    size_t i = 0;

    load_candidates();

    for(i = 0; i < NUMBER_OF_CANDIDATES; i++) {
         candidate = create_candidates(i);
         if(candidate == NULL) {
             fprintf(stderr, "Cannot failed to initalize candidate [ %d ]\n", i);
         }

         /* Create array of candidates */
         cand_data[i] = create_candidate_data(candidate, i);
         fill_candidates(cand_data[i]->candidate);
    }

    /* Display each candidate */
    for(i = 0; i < NUMBER_OF_CANDIDATES; i++) {
        display_candidate(cand_data[i]->candidate);
        printf("\n");
    }

    for(i = 0; i < NUMBER_OF_CANDIDATES; i++) {
        destroy_candidata_data(cand_data[i]);
    }

    return 0;
}

static Candidate_data* create_candidate_data(Candidates_t *candidate, size_t id)
{
    Candidate_data *cand_data = NULL;

    cand_data = malloc(sizeof *cand_data);

    if(cand_data == NULL) {
        fprintf(stderr, "Failed to allocate memory [ %s ]\n",
                strerror(errno));

        return NULL;
    }
    cand_data->candidate_data_id = id;
    cand_data->candidate = candidate;

    return cand_data;
}

static void destroy_candidata_data(Candidate_data *cand_data)
{
    destroy_candidate(cand_data->candidate);
    free(cand_data);
}