static int create_kernel_qp(struct mlx5_ib_dev *dev,
			    struct ib_qp_init_attr *init_attr,
			    struct mlx5_ib_qp *qp,
			    u32 **in, int *inlen,
			    struct mlx5_ib_qp_base *base)
{
	int uar_index;
	void *qpc;
	int err;

	if (init_attr->create_flags & ~(IB_QP_CREATE_SIGNATURE_EN |
					IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK |
					IB_QP_CREATE_IPOIB_UD_LSO |
					IB_QP_CREATE_NETIF_QP |
					mlx5_ib_create_qp_sqpn_qp1()))
		return -EINVAL;

	if (init_attr->qp_type == MLX5_IB_QPT_REG_UMR)
		qp->bf.bfreg = &dev->fp_bfreg;
	else
		qp->bf.bfreg = &dev->bfreg;

	/* We need to divide by two since each register is comprised of
	 * two buffers of identical size, namely odd and even
	 */
	qp->bf.buf_size = (1 << MLX5_CAP_GEN(dev->mdev, log_bf_reg_size)) / 2;
	uar_index = qp->bf.bfreg->index;

	err = calc_sq_size(dev, init_attr, qp);
	if (err < 0) {
		mlx5_ib_dbg(dev, "err %d\n", err);
		return err;
	}

	qp->rq.offset = 0;
	qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
	base->ubuffer.buf_size = err + (qp->rq.wqe_cnt << qp->rq.wqe_shift);

	err = mlx5_buf_alloc(dev->mdev, base->ubuffer.buf_size, &qp->buf);
	if (err) {
		mlx5_ib_dbg(dev, "err %d\n", err);
		return err;
	}

	qp->sq.qend = mlx5_get_send_wqe(qp, qp->sq.wqe_cnt);
	*inlen = MLX5_ST_SZ_BYTES(create_qp_in) +
		 MLX5_FLD_SZ_BYTES(create_qp_in, pas[0]) * qp->buf.npages;
	*in = kvzalloc(*inlen, GFP_KERNEL);
	if (!*in) {
		err = -ENOMEM;
		goto err_buf;
	}

	qpc = MLX5_ADDR_OF(create_qp_in, *in, qpc);
	MLX5_SET(qpc, qpc, uar_page, uar_index);
	MLX5_SET(qpc, qpc, log_page_size, qp->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT);

	/* Set "fast registration enabled" for all kernel QPs */
	MLX5_SET(qpc, qpc, fre, 1);
	MLX5_SET(qpc, qpc, rlky, 1);

	if (init_attr->create_flags & mlx5_ib_create_qp_sqpn_qp1()) {
		MLX5_SET(qpc, qpc, deth_sqpn, 1);
		qp->flags |= MLX5_IB_QP_SQPN_QP1;
	}

	mlx5_fill_page_array(&qp->buf,
			     (__be64 *)MLX5_ADDR_OF(create_qp_in, *in, pas));

	err = mlx5_db_alloc(dev->mdev, &qp->db);
	if (err) {
		mlx5_ib_dbg(dev, "err %d\n", err);
		goto err_free;
	}

	qp->sq.wrid = kvmalloc_array(qp->sq.wqe_cnt,
				     sizeof(*qp->sq.wrid), GFP_KERNEL);
	qp->sq.wr_data = kvmalloc_array(qp->sq.wqe_cnt,
					sizeof(*qp->sq.wr_data), GFP_KERNEL);
	qp->rq.wrid = kvmalloc_array(qp->rq.wqe_cnt,
				     sizeof(*qp->rq.wrid), GFP_KERNEL);
	qp->sq.w_list = kvmalloc_array(qp->sq.wqe_cnt,
				       sizeof(*qp->sq.w_list), GFP_KERNEL);
	qp->sq.wqe_head = kvmalloc_array(qp->sq.wqe_cnt,
					 sizeof(*qp->sq.wqe_head), GFP_KERNEL);

	if (!qp->sq.wrid || !qp->sq.wr_data || !qp->rq.wrid ||
	    !qp->sq.w_list || !qp->sq.wqe_head) {
		err = -ENOMEM;
		goto err_wrid;
	}
	qp->create_type = MLX5_QP_KERNEL;

	return 0;

err_wrid:
	kvfree(qp->sq.wqe_head);
	kvfree(qp->sq.w_list);
	kvfree(qp->sq.wrid);
	kvfree(qp->sq.wr_data);
	kvfree(qp->rq.wrid);
	mlx5_db_free(dev->mdev, &qp->db);

err_free:
	kvfree(*in);

err_buf:
	mlx5_buf_free(dev->mdev, &qp->buf);
	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.