static int prepare_user_rq(struct ib_pd *pd,
			   struct ib_wq_init_attr *init_attr,
			   struct ib_udata *udata,
			   struct mlx5_ib_rwq *rwq)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_ib_create_wq ucmd = {};
	int err;
	size_t required_cmd_sz;

	required_cmd_sz = offsetof(typeof(ucmd), single_stride_log_num_of_bytes)
		+ sizeof(ucmd.single_stride_log_num_of_bytes);
	if (udata->inlen < required_cmd_sz) {
		mlx5_ib_dbg(dev, "invalid inlen\n");
		return -EINVAL;
	}

	if (udata->inlen > sizeof(ucmd) &&
	    !ib_is_udata_cleared(udata, sizeof(ucmd),
				 udata->inlen - sizeof(ucmd))) {
		mlx5_ib_dbg(dev, "inlen is not supported\n");
		return -EOPNOTSUPP;
	}

	if (ib_copy_from_udata(&ucmd, udata, min(sizeof(ucmd), udata->inlen))) {
		mlx5_ib_dbg(dev, "copy failed\n");
		return -EFAULT;
	}

	if (ucmd.comp_mask & (~MLX5_IB_CREATE_WQ_STRIDING_RQ)) {
		mlx5_ib_dbg(dev, "invalid comp mask\n");
		return -EOPNOTSUPP;
	} else if (ucmd.comp_mask & MLX5_IB_CREATE_WQ_STRIDING_RQ) {
		if (!MLX5_CAP_GEN(dev->mdev, striding_rq)) {
			mlx5_ib_dbg(dev, "Striding RQ is not supported\n");
			return -EOPNOTSUPP;
		}
		if ((ucmd.single_stride_log_num_of_bytes <
		    MLX5_MIN_SINGLE_STRIDE_LOG_NUM_BYTES) ||
		    (ucmd.single_stride_log_num_of_bytes >
		     MLX5_MAX_SINGLE_STRIDE_LOG_NUM_BYTES)) {
			mlx5_ib_dbg(dev, "Invalid log stride size (%u. Range is %u - %u)\n",
				    ucmd.single_stride_log_num_of_bytes,
				    MLX5_MIN_SINGLE_STRIDE_LOG_NUM_BYTES,
				    MLX5_MAX_SINGLE_STRIDE_LOG_NUM_BYTES);
			return -EINVAL;
		}
		if ((ucmd.single_wqe_log_num_of_strides >
		    MLX5_MAX_SINGLE_WQE_LOG_NUM_STRIDES) ||
		     (ucmd.single_wqe_log_num_of_strides <
			MLX5_MIN_SINGLE_WQE_LOG_NUM_STRIDES)) {
			mlx5_ib_dbg(dev, "Invalid log num strides (%u. Range is %u - %u)\n",
				    ucmd.single_wqe_log_num_of_strides,
				    MLX5_MIN_SINGLE_WQE_LOG_NUM_STRIDES,
				    MLX5_MAX_SINGLE_WQE_LOG_NUM_STRIDES);
			return -EINVAL;
		}
		rwq->single_stride_log_num_of_bytes =
			ucmd.single_stride_log_num_of_bytes;
		rwq->log_num_strides = ucmd.single_wqe_log_num_of_strides;
		rwq->two_byte_shift_en = !!ucmd.two_byte_shift_en;
		rwq->create_flags |= MLX5_IB_WQ_FLAGS_STRIDING_RQ;
	}

	err = set_user_rq_size(dev, init_attr, &ucmd, rwq);
	if (err) {
		mlx5_ib_dbg(dev, "err %d\n", err);
		return err;
	}

	err = create_user_rq(dev, pd, rwq, &ucmd);
	if (err) {
		mlx5_ib_dbg(dev, "err %d\n", err);
		if (err)
			return err;
	}

	rwq->user_index = ucmd.user_index;
	return 0;
}

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.