Malloc and Realloc crash in C? - c

Question

i have to do with my friend a program in C for my school.
The problem is, when i would malloc a pointer, it doesn't work, and the application will crashed.
But not in debug mod. In debug mod, it works.
This is a part of my code:
#include <bplus.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define LOG "log.txt"
#define LOGIDX "log.idx"
struct event {
time_t nb;
char *username;
int type;
char *message;
};
struct eventlist {
struct event event;
struct eventlist *nextelem;
};
struct eventlist *getEventList(time_t date);
void insert(struct eventlist *list, struct eventlist *event);
struct event getEventFromString(char *str);
char *getLine(FILE *file);
int file_exists(const char *fname);
char *dechiffrer(const char *pChaineChiffree);
int main(void) {
time_t timenow = time(NULL);
struct tm *tm = gmtime(&timenow);
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
time_t time = mktime(tm);
struct eventlist *list = getEventList(time);
return 0;
}
struct eventlist *getEventList(time_t date) {
int end = 0;
FILE *file = NULL;
char str[20];
char *line = NULL;
char *uncode = NULL;
ENTRY e;
IX_DESC faddress;
struct eventlist *list = NULL; // Liste a retourner
struct event *event = NULL; // Contient l'evenement
struct eventlist *templist = NULL; // Contient l'evenement a mettre dans list
// On ouvre / crée le fichier .idx
if (file_exists(LOGIDX))
open_index(LOGIDX, &faddress, 0);
else
make_index(LOGIDX, &faddress, 0);
// On ouvre le fichier de log
if ((file = fopen(LOG, "rb")) != NULL) {
// On met dans e.key le temps
sprintf(str, "%d", (int) date);
strcpy(e.key, str);
if (find_key(&e, &faddress)) { // Si la clé existe
fseek(file, e.recptr, SEEK_SET); // On se positionne
line = getLine(file); // On récupère la ligne
while (!feof(file) && !end) { // Boucle principale
printf("\ngetEventList 1");
if (line != NULL) {
uncode = dechiffrer(line); // On déchiffre la ligne
printf("\ngetEventList 2");
event = (struct event *) malloc(sizeof(struct event *) * 1); // On alloue de la place
printf("\ngetEventList 3");
if (event) {
*event = getEventFromString(uncode); // On la transforme en structure
printf("\ngetEventList 4");
if (event->nb < date + 86400) {
templist = (struct eventlist *) malloc(sizeof(struct eventlist *) * 1);
printf("\ngetEventList 5");
if (templist) {
templist->event = *event;
templist->nextelem = NULL;
printf("\ngetEventList 6");
if (list == NULL)
list = templist;
else
insert(list, templist);
printf("\ngetEventList 7");
line = getLine(file); // On récupère la ligne
printf("\ngetEventList 8");
} else {
list = NULL;
end = 1;
}
} else
end = 1;
} else {
list = NULL;
end = 1;
}
} else
end = 1;
}
} else { // Sinon, on affiche un message
list = NULL;
printf("\nErreur: Clé non trouvée !");
}
fclose(file);
} else {
list = NULL;
printf("\nErreur lors de l'ouverture du fichier !");
}
return list;
}
void insert(struct eventlist *list, struct eventlist *event) {
struct eventlist *temp = list;
struct eventlist *lasttemp = NULL;
printf("\n(%s %s)", temp->event.username, event->event.username);
while (temp->nextelem != NULL && stricmp(temp->event.username, event->event.username)) {
temp = temp->nextelem;
}
lasttemp = temp;
while (temp != NULL && !stricmp(temp->event.username, event->event.username)) {
lasttemp = temp;
temp = temp->nextelem;
}
event->nextelem = temp;
lasttemp->nextelem = event;
}
struct event getEventFromString(char *str) {
struct event event;
event.nb = 0;
event.type = 0;
event.username = NULL;
event.message = NULL;
int time;
int type;
char *username = (char *) malloc(sizeof(char *) * strlen(str));
char *message = (char *) malloc(sizeof(char *) * strlen(str));
if (sscanf(str, "%d %d %s %[^\n]s", &(time), &(type), username, message)) {
event.nb = (time_t) time;
event.type = type;
event.username = username;
event.message = message;
}
return event;
}
char *getLine(FILE *file) {
char *line = NULL;
unsigned char c;
int end = 0;
int ln = 0;
printf("\ngetLine 1");
line = (char *) malloc(sizeof(char *) * 1);
printf("\ngetLine 2");
if (line != NULL) {
while(!feof(file) && !end) {
c = fgetc(file);
if (c != '\n' && c != '\r') {
printf("\nDEBUG: %c %d %s", c, ln, line);
line = (char *) realloc(line, sizeof(char *) * (ln + 2));
if (line != NULL) {
line[ln++] = c;
line[ln] = '\0';
} else
end = 1;
} else
end = 1;
}
line[ln] = '\0';
}
if (line[0] == '\0' || line[1] == '\0')
line = NULL;
return line;
}
int file_exists(const char *fname) {
FILE *file;
int returncode = 0;
if ((file = fopen(fname, "r"))) {
fclose(file);
returncode = 1;
}
return returncode;
}
char *dechiffrer(const char *pChaineChiffree) {
char *dechiff;
unsigned char car;
unsigned int i;
dechiff = malloc(strlen(pChaineChiffree) + 1);
for (i = 0; pChaineChiffree[i] != '\0'; i++) {
car = pChaineChiffree[i];
car = (car & 0x0F) << 4 | (car & 0xF0) >> 4;
// car -= 0x55;
dechiff[i] = car;
}
dechiff[i] = '\0';
return dechiff;
}
I think it's a bufferoverflow, but i don't know where is the problem, and why it's bugged.
The crash occured in this malloc:
printf("\ngetLine 1");
line = (char *) malloc(sizeof(char *) * 1);
printf("\ngetLine 2");
Please help me
Thanks
0ddlyoko
EDIT:
Ok i've found the problem, it was with all my sizeof(XXX *), i've just changed this to sizeof(XXX).
Thanks !