static int mlx5_ib_umem_get(struct mlx5_ib_dev *dev,
			    struct ib_pd *pd,
			    unsigned long addr, size_t size,
			    struct ib_umem **umem,
			    int *npages, int *page_shift, int *ncont,
			    u32 *offset)
{
	int err;

	*umem = ib_umem_get(pd->uobject->context, addr, size, 0, 0);
	if (IS_ERR(*umem)) {
		mlx5_ib_dbg(dev, "umem_get failed\n");
		return PTR_ERR(*umem);
	}

	mlx5_ib_cont_pages(*umem, addr, 0, npages, page_shift, ncont, NULL);

	err = mlx5_ib_get_buf_offset(addr, *page_shift, offset);
	if (err) {
		mlx5_ib_warn(dev, "bad offset\n");
		goto err_umem;
	}

	mlx5_ib_dbg(dev, "addr 0x%lx, size %zu, npages %d, page_shift %d, ncont %d, offset %d\n",
		    addr, size, *npages, *page_shift, *ncont, *offset);

	return 0;

err_umem:
	ib_umem_release(*umem);
	*umem = NULL;

	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.