int qeth_query_oat_command(struct qeth_card *card, char __user *udata)
{
	int rc = 0;
	struct qeth_cmd_buffer *iob;
	struct qeth_ipa_cmd *cmd;
	struct qeth_query_oat *oat_req;
	struct qeth_query_oat_data oat_data;
	struct qeth_qoat_priv priv;
	void __user *tmp;

	QETH_CARD_TEXT(card, 3, "qoatcmd");

	if (!qeth_adp_supported(card, IPA_SETADP_QUERY_OAT)) {
		rc = -EOPNOTSUPP;
		goto out;
	}

	if (copy_from_user(&oat_data, udata,
	    sizeof(struct qeth_query_oat_data))) {
			rc = -EFAULT;
			goto out;
	}

	priv.buffer_len = oat_data.buffer_len;
	priv.response_len = 0;
	priv.buffer =  kzalloc(oat_data.buffer_len, GFP_KERNEL);
	if (!priv.buffer) {
		rc = -ENOMEM;
		goto out;
	}

	iob = qeth_get_adapter_cmd(card, IPA_SETADP_QUERY_OAT,
				   sizeof(struct qeth_ipacmd_setadpparms_hdr) +
				   sizeof(struct qeth_query_oat));
	cmd = (struct qeth_ipa_cmd *)(iob->data+IPA_PDU_HEADER_SIZE);
	oat_req = &cmd->data.setadapterparms.data.query_oat;
	oat_req->subcmd_code = oat_data.command;

	rc = qeth_send_ipa_cmd(card, iob, qeth_setadpparms_query_oat_cb,
			       &priv);
	if (!rc) {
		if (is_compat_task())
			tmp = compat_ptr(oat_data.ptr);
		else
			tmp = (void __user *)(unsigned long)oat_data.ptr;

		if (copy_to_user(tmp, priv.buffer,
		    priv.response_len)) {
			rc = -EFAULT;
			goto out_free;
		}

		oat_data.response_len = priv.response_len;

		if (copy_to_user(udata, &oat_data,
		    sizeof(struct qeth_query_oat_data)))
			rc = -EFAULT;
	} else
		if (rc == IPA_RC_FFFF)
			rc = -EFAULT;

out_free:
	kfree(priv.buffer);
out:
	return rc;
}

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.