static void lock_mutex(pthread_mutex_t *l)
{
	int ret;

	if ((ret = pthread_mutex_lock(l)) != 0) {
		fprintf(stderr, "pthread_mutex_lock returned:%d %s\n", ret, strerror(ret));
		dump_stacktrace();
		exit(1);
	}
}

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.