static int create_user_rq(struct mlx5_ib_dev *dev, struct ib_pd *pd,
			  struct mlx5_ib_rwq *rwq,
			  struct mlx5_ib_create_wq *ucmd)
{
	struct mlx5_ib_ucontext *context;
	int page_shift = 0;
	int npages;
	u32 offset = 0;
	int ncont = 0;
	int err;

	if (!ucmd->buf_addr)
		return -EINVAL;

	context = to_mucontext(pd->uobject->context);
	rwq->umem = ib_umem_get(pd->uobject->context, ucmd->buf_addr,
			       rwq->buf_size, 0, 0);
	if (IS_ERR(rwq->umem)) {
		mlx5_ib_dbg(dev, "umem_get failed\n");
		err = PTR_ERR(rwq->umem);
		return err;
	}

	mlx5_ib_cont_pages(rwq->umem, ucmd->buf_addr, 0, &npages, &page_shift,
			   &ncont, NULL);
	err = mlx5_ib_get_buf_offset(ucmd->buf_addr, page_shift,
				     &rwq->rq_page_offset);
	if (err) {
		mlx5_ib_warn(dev, "bad offset\n");
		goto err_umem;
	}

	rwq->rq_num_pas = ncont;
	rwq->page_shift = page_shift;
	rwq->log_page_size =  page_shift - MLX5_ADAPTER_PAGE_SHIFT;
	rwq->wq_sig = !!(ucmd->flags & MLX5_WQ_FLAG_SIGNATURE);

	mlx5_ib_dbg(dev, "addr 0x%llx, size %zd, npages %d, page_shift %d, ncont %d, offset %d\n",
		    (unsigned long long)ucmd->buf_addr, rwq->buf_size,
		    npages, page_shift, ncont, offset);

	err = mlx5_ib_db_map_user(context, ucmd->db_addr, &rwq->db);
	if (err) {
		mlx5_ib_dbg(dev, "map failed\n");
		goto err_umem;
	}

	rwq->create_type = MLX5_WQ_USER;
	return 0;

err_umem:
	ib_umem_release(rwq->umem);
	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.