int mlx5_ib_modify_wq(struct ib_wq *wq, struct ib_wq_attr *wq_attr,
		      u32 wq_attr_mask, struct ib_udata *udata)
{
	struct mlx5_ib_dev *dev = to_mdev(wq->device);
	struct mlx5_ib_rwq *rwq = to_mrwq(wq);
	struct mlx5_ib_modify_wq ucmd = {};
	size_t required_cmd_sz;
	int curr_wq_state;
	int wq_state;
	int inlen;
	int err;
	void *rqc;
	void *in;

	required_cmd_sz = offsetof(typeof(ucmd), reserved) + sizeof(ucmd.reserved);
	if (udata->inlen < required_cmd_sz)
		return -EINVAL;

	if (udata->inlen > sizeof(ucmd) &&
	    !ib_is_udata_cleared(udata, sizeof(ucmd),
				 udata->inlen - sizeof(ucmd)))
		return -EOPNOTSUPP;

	if (ib_copy_from_udata(&ucmd, udata, min(sizeof(ucmd), udata->inlen)))
		return -EFAULT;

	if (ucmd.comp_mask || ucmd.reserved)
		return -EOPNOTSUPP;

	inlen = MLX5_ST_SZ_BYTES(modify_rq_in);
	in = kvzalloc(inlen, GFP_KERNEL);
	if (!in)
		return -ENOMEM;

	rqc = MLX5_ADDR_OF(modify_rq_in, in, ctx);

	curr_wq_state = (wq_attr_mask & IB_WQ_CUR_STATE) ?
		wq_attr->curr_wq_state : wq->state;
	wq_state = (wq_attr_mask & IB_WQ_STATE) ?
		wq_attr->wq_state : curr_wq_state;
	if (curr_wq_state == IB_WQS_ERR)
		curr_wq_state = MLX5_RQC_STATE_ERR;
	if (wq_state == IB_WQS_ERR)
		wq_state = MLX5_RQC_STATE_ERR;
	MLX5_SET(modify_rq_in, in, rq_state, curr_wq_state);
	MLX5_SET(rqc, rqc, state, wq_state);

	if (wq_attr_mask & IB_WQ_FLAGS) {
		if (wq_attr->flags_mask & IB_WQ_FLAGS_CVLAN_STRIPPING) {
			if (!(MLX5_CAP_GEN(dev->mdev, eth_net_offloads) &&
			      MLX5_CAP_ETH(dev->mdev, vlan_cap))) {
				mlx5_ib_dbg(dev, "VLAN offloads are not "
					    "supported\n");
				err = -EOPNOTSUPP;
				goto out;
			}
			MLX5_SET64(modify_rq_in, in, modify_bitmask,
				   MLX5_MODIFY_RQ_IN_MODIFY_BITMASK_VSD);
			MLX5_SET(rqc, rqc, vsd,
				 (wq_attr->flags & IB_WQ_FLAGS_CVLAN_STRIPPING) ? 0 : 1);
		}

		if (wq_attr->flags_mask & IB_WQ_FLAGS_PCI_WRITE_END_PADDING) {
			mlx5_ib_dbg(dev, "Modifying scatter end padding is not supported\n");
			err = -EOPNOTSUPP;
			goto out;
		}
	}

	if (curr_wq_state == IB_WQS_RESET && wq_state == IB_WQS_RDY) {
		if (MLX5_CAP_GEN(dev->mdev, modify_rq_counter_set_id)) {
			MLX5_SET64(modify_rq_in, in, modify_bitmask,
				   MLX5_MODIFY_RQ_IN_MODIFY_BITMASK_RQ_COUNTER_SET_ID);
			MLX5_SET(rqc, rqc, counter_set_id,
				 dev->port->cnts.set_id);
		} else
			pr_info_once("%s: Receive WQ counters are not supported on current FW\n",
				     dev->ib_dev.name);
	}

	err = mlx5_core_modify_rq(dev->mdev, rwq->core_qp.qpn, in, inlen);
	if (!err)
		rwq->ibwq.state = (wq_state == MLX5_RQC_STATE_ERR) ? IB_WQS_ERR : wq_state;

out:
	kvfree(in);
	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.