Heap buffer overflow on a getline() - C - c

Question

I am coding a local server, I need to parse a file to get the config of the server.
Problem : I have a heap buffer overflow indicated at on the while.
This probeme is shown when I run with -fsanitize but I don't have any trouble without.
Here is the code :
struct container *configParse(FILE *file)
{
char *line = NULL;
size_t n;
char *token = NULL;
char *saveptr = NULL;
struct container *head = NULL;
struct container *container = NULL;
int key = 0;
int first = 1;
while ((getline(&line, &n, file)) != -1)
{
token = strtok_r(saveptr, " =\n\r", &line);
while (token != NULL)
{
if (token[0] == '[')
{
if (first)
{
container = container_init();
container->title = token;
head = container;
first = 0;
}
else
{
container = container_add_back(container);
container = container->next;
container->item = NULL;
container->title = token;
}
key = 0;
}
else
{
if (key == 0)
{
if (container->item == NULL)
{
container->item = items_init();
container->item->key = token;
}
else
{
struct item *itemcpy = container->item;
while (itemcpy->next != NULL)
{
itemcpy = itemcpy->next;
}
itemcpy->next = items_init();
itemcpy->next->key = token;
}
key = 1;
}
else
{
struct item *itemcpy = container->item;
while (itemcpy->next != NULL)
{
itemcpy = itemcpy->next;
}
itemcpy->value = token;
key = 0;
}
}
token = strtok_r(NULL, " =\n\r", &line);
}
}
container_print(head);
printf("\n*****Parsing du .conf*****\n\n");
if (isvalid(head))
printf("Parsing OK\n");
else
{
printf("Parsing KO\n");
return NULL;
}
return head;
}
Thanks in advance.
As explained I try to run the program without -fsanitze, and everything was fine