static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
					   int time)
{
	enum si_sm_result si_sm_result;

restart:
	/*
	 * There used to be a loop here that waited a little while
	 * (around 25us) before giving up.  That turned out to be
	 * pointless, the minimum delays I was seeing were in the 300us
	 * range, which is far too long to wait in an interrupt.  So
	 * we just run until the state machine tells us something
	 * happened or it needs a delay.
	 */
	si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
	time = 0;
	while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
		si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);

	if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) {
		smi_inc_stat(smi_info, complete_transactions);

		handle_transaction_done(smi_info);
		goto restart;
	} else if (si_sm_result == SI_SM_HOSED) {
		smi_inc_stat(smi_info, hosed_count);

		/*
		 * Do the before return_hosed_msg, because that
		 * releases the lock.
		 */
		smi_info->si_state = SI_NORMAL;
		if (smi_info->curr_msg != NULL) {
			/*
			 * If we were handling a user message, format
			 * a response to send to the upper layer to
			 * tell it about the error.
			 */
			return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED);
		}
		goto restart;
	}

	/*
	 * We prefer handling attn over new messages.  But don't do
	 * this if there is not yet an upper layer to handle anything.
	 */
	if (si_sm_result == SI_SM_ATTN || smi_info->got_attn) {
		unsigned char msg[2];

		if (smi_info->si_state != SI_NORMAL) {
			/*
			 * We got an ATTN, but we are doing something else.
			 * Handle the ATTN later.
			 */
			smi_info->got_attn = true;
		} else {
			smi_info->got_attn = false;
			smi_inc_stat(smi_info, attentions);

			/*
			 * Got a attn, send down a get message flags to see
			 * what's causing it.  It would be better to handle
			 * this in the upper layer, but due to the way
			 * interrupts work with the SMI, that's not really
			 * possible.
			 */
			msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
			msg[1] = IPMI_GET_MSG_FLAGS_CMD;

			start_new_msg(smi_info, msg, 2);
			smi_info->si_state = SI_GETTING_FLAGS;
			goto restart;
		}
	}

	/* If we are currently idle, try to start the next message. */
	if (si_sm_result == SI_SM_IDLE) {
		smi_inc_stat(smi_info, idles);

		si_sm_result = start_next_msg(smi_info);
		if (si_sm_result != SI_SM_IDLE)
			goto restart;
	}

	if ((si_sm_result == SI_SM_IDLE)
	    && (atomic_read(&smi_info->req_events))) {
		/*
		 * We are idle and the upper layer requested that I fetch
		 * events, so do so.
		 */
		atomic_set(&smi_info->req_events, 0);

		/*
		 * Take this opportunity to check the interrupt and
		 * message enable state for the BMC.  The BMC can be
		 * asynchronously reset, and may thus get interrupts
		 * disable and messages disabled.
		 */
		if (smi_info->supports_event_msg_buff || smi_info->io.irq) {
			start_check_enables(smi_info);
		} else {
			smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
			if (!smi_info->curr_msg)
				goto out;

			start_getting_events(smi_info);
		}
		goto restart;
	}

	if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) {
		/* Ok it if fails, the timer will just go off. */
		if (del_timer(&smi_info->si_timer))
			smi_info->timer_running = false;
	}

out:
	return si_sm_result;
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.