static int megasas_start_aen(struct megasas_instance *instance)
{
	struct megasas_evt_log_info eli;
	union megasas_evt_class_locale class_locale;

	/*
	 * Get the latest sequence number from FW
	 */
	memset(&eli, 0, sizeof(eli));

	if (megasas_get_seq_num(instance, &eli))
		return -1;

	/*
	 * Register AEN with FW for latest sequence number plus 1
	 */
	class_locale.members.reserved = 0;
	class_locale.members.locale = MR_EVT_LOCALE_ALL;
	class_locale.members.class = MR_EVT_CLASS_DEBUG;

	return megasas_register_aen(instance,
			le32_to_cpu(eli.newest_seq_num) + 1,
			class_locale.word);
}

The product dereferences a pointer that it expects to be valid but is NULL.