static struct qeth_ipa_cmd *qeth_check_ipa_data(struct qeth_card *card,
		struct qeth_cmd_buffer *iob)
{
	struct qeth_ipa_cmd *cmd = NULL;

	QETH_CARD_TEXT(card, 5, "chkipad");
	if (IS_IPA(iob->data)) {
		cmd = (struct qeth_ipa_cmd *) PDU_ENCAPSULATION(iob->data);
		if (IS_IPA_REPLY(cmd)) {
			if (cmd->hdr.command != IPA_CMD_SETCCID &&
			    cmd->hdr.command != IPA_CMD_DELCCID &&
			    cmd->hdr.command != IPA_CMD_MODCCID &&
			    cmd->hdr.command != IPA_CMD_SET_DIAG_ASS)
				qeth_issue_ipa_msg(cmd,
						cmd->hdr.return_code, card);
			return cmd;
		} else {
			switch (cmd->hdr.command) {
			case IPA_CMD_STOPLAN:
				if (cmd->hdr.return_code ==
						IPA_RC_VEPA_TO_VEB_TRANSITION) {
					dev_err(&card->gdev->dev,
					   "Interface %s is down because the "
					   "adjacent port is no longer in "
					   "reflective relay mode\n",
					   QETH_CARD_IFNAME(card));
					qeth_close_dev(card);
				} else {
					dev_warn(&card->gdev->dev,
					   "The link for interface %s on CHPID"
					   " 0x%X failed\n",
					   QETH_CARD_IFNAME(card),
					   card->info.chpid);
					qeth_issue_ipa_msg(cmd,
						cmd->hdr.return_code, card);
				}
				card->lan_online = 0;
				if (card->dev && netif_carrier_ok(card->dev))
					netif_carrier_off(card->dev);
				return NULL;
			case IPA_CMD_STARTLAN:
				dev_info(&card->gdev->dev,
					   "The link for %s on CHPID 0x%X has"
					   " been restored\n",
					   QETH_CARD_IFNAME(card),
					   card->info.chpid);
				netif_carrier_on(card->dev);
				card->lan_online = 1;
				if (card->info.hwtrap)
					card->info.hwtrap = 2;
				qeth_schedule_recovery(card);
				return NULL;
			case IPA_CMD_MODCCID:
				return cmd;
			case IPA_CMD_REGISTER_LOCAL_ADDR:
				QETH_CARD_TEXT(card, 3, "irla");
				break;
			case IPA_CMD_UNREGISTER_LOCAL_ADDR:
				QETH_CARD_TEXT(card, 3, "urla");
				break;
			default:
				QETH_DBF_MESSAGE(2, "Received data is IPA "
					   "but not a reply!\n");
				break;
			}
		}
	}
	return cmd;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.