static int query_qp_attr(struct mlx5_ib_dev *dev, struct mlx5_ib_qp *qp,
			 struct ib_qp_attr *qp_attr)
{
	int outlen = MLX5_ST_SZ_BYTES(query_qp_out);
	struct mlx5_qp_context *context;
	int mlx5_state;
	u32 *outb;
	int err = 0;

	outb = kzalloc(outlen, GFP_KERNEL);
	if (!outb)
		return -ENOMEM;

	err = mlx5_core_qp_query(dev->mdev, &qp->trans_qp.base.mqp, outb,
				 outlen);
	if (err)
		goto out;

	/* FIXME: use MLX5_GET rather than mlx5_qp_context manual struct */
	context = (struct mlx5_qp_context *)MLX5_ADDR_OF(query_qp_out, outb, qpc);

	mlx5_state = be32_to_cpu(context->flags) >> 28;

	qp->state		     = to_ib_qp_state(mlx5_state);
	qp_attr->path_mtu	     = context->mtu_msgmax >> 5;
	qp_attr->path_mig_state	     =
		to_ib_mig_state((be32_to_cpu(context->flags) >> 11) & 0x3);
	qp_attr->qkey		     = be32_to_cpu(context->qkey);
	qp_attr->rq_psn		     = be32_to_cpu(context->rnr_nextrecvpsn) & 0xffffff;
	qp_attr->sq_psn		     = be32_to_cpu(context->next_send_psn) & 0xffffff;
	qp_attr->dest_qp_num	     = be32_to_cpu(context->log_pg_sz_remote_qpn) & 0xffffff;
	qp_attr->qp_access_flags     =
		to_ib_qp_access_flags(be32_to_cpu(context->params2));

	if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
		to_rdma_ah_attr(dev, &qp_attr->ah_attr, &context->pri_path);
		to_rdma_ah_attr(dev, &qp_attr->alt_ah_attr, &context->alt_path);
		qp_attr->alt_pkey_index =
			be16_to_cpu(context->alt_path.pkey_index);
		qp_attr->alt_port_num	=
			rdma_ah_get_port_num(&qp_attr->alt_ah_attr);
	}

	qp_attr->pkey_index = be16_to_cpu(context->pri_path.pkey_index);
	qp_attr->port_num = context->pri_path.port;

	/* qp_attr->en_sqd_async_notify is only applicable in modify qp */
	qp_attr->sq_draining = mlx5_state == MLX5_QP_STATE_SQ_DRAINING;

	qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context->params1) >> 21) & 0x7);

	qp_attr->max_dest_rd_atomic =
		1 << ((be32_to_cpu(context->params2) >> 21) & 0x7);
	qp_attr->min_rnr_timer	    =
		(be32_to_cpu(context->rnr_nextrecvpsn) >> 24) & 0x1f;
	qp_attr->timeout	    = context->pri_path.ackto_lt >> 3;
	qp_attr->retry_cnt	    = (be32_to_cpu(context->params1) >> 16) & 0x7;
	qp_attr->rnr_retry	    = (be32_to_cpu(context->params1) >> 13) & 0x7;
	qp_attr->alt_timeout	    = context->alt_path.ackto_lt >> 3;

out:
	kfree(outb);
	return err;
}

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.