linux-kernel - RE: [EXT] [PATCH v3] qedr: fix resource leak in qedr_create

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Date:   Tue, 15 Sep 2020 06:41:50 +0000
From:   Michal Kalderon <mkalderon@...vell.com>
To:     Keita Suzuki <keitasuzuki.park@...ab.ics.keio.ac.jp>
CC:     "takafumi@...ab.ics.keio.ac.jp" <takafumi@...ab.ics.keio.ac.jp>,
        "Ariel Elior" <aelior@...vell.com>,
        Doug Ledford <dledford@...hat.com>,
        "Jason Gunthorpe" <jgg@...pe.ca>,
        Yuval Bason <yuval.bason@...ium.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH v3] qedr: fix resource leak in qedr_create_qp

> From: Keita Suzuki <keitasuzuki.park@...ab.ics.keio.ac.jp>
> Sent: Friday, September 11, 2020 3:52 PM
> When xa_insert() fails, the acquired resource in qedr_create_qp should also
> be freed. However, current implementation does not handle the error.
> 
> Fix this by adding a new goto label that calls qedr_free_qp_resources.
> 
> Fixes: 1212767e23bb ("qedr: Add wrapping generic structure for qpidr and
> adjust idr routines.")
> Signed-off-by: Keita Suzuki <keitasuzuki.park@...ab.ics.keio.ac.jp>
> ---
> changelog(v3): Fix linebreak of the fix tag
> changelog(v2): Change numbered labels to descriptive labels
> 
>  drivers/infiniband/hw/qedr/verbs.c | 52 ++++++++++++++++--------------
>  1 file changed, 27 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/qedr/verbs.c
> b/drivers/infiniband/hw/qedr/verbs.c
> index b49bef94637e..3b4c84f67023 100644
> --- a/drivers/infiniband/hw/qedr/verbs.c
> +++ b/drivers/infiniband/hw/qedr/verbs.c
> @@ -2112,6 +2112,28 @@ static int qedr_create_kernel_qp(struct qedr_dev
> *dev,
>  	return rc;
>  }
> 
> +static int qedr_free_qp_resources(struct qedr_dev *dev, struct qedr_qp
> *qp,
> +				  struct ib_udata *udata)
> +{
> +	struct qedr_ucontext *ctx =
> +		rdma_udata_to_drv_context(udata, struct qedr_ucontext,
> +					  ibucontext);
> +	int rc;
> +
> +	if (qp->qp_type != IB_QPT_GSI) {
> +		rc = dev->ops->rdma_destroy_qp(dev->rdma_ctx, qp-
> >qed_qp);
> +		if (rc)
> +			return rc;
> +	}
> +
> +	if (qp->create_type == QEDR_QP_CREATE_USER)
> +		qedr_cleanup_user(dev, ctx, qp);
> +	else
> +		qedr_cleanup_kernel(dev, qp);
> +
> +	return 0;
> +}
> +
>  struct ib_qp *qedr_create_qp(struct ib_pd *ibpd,
>  			     struct ib_qp_init_attr *attrs,
>  			     struct ib_udata *udata)
> @@ -2158,19 +2180,21 @@ struct ib_qp *qedr_create_qp(struct ib_pd
> *ibpd,
>  		rc = qedr_create_kernel_qp(dev, qp, ibpd, attrs);
> 
>  	if (rc)
> -		goto err;
> +		goto out_free_qp;
> 
>  	qp->ibqp.qp_num = qp->qp_id;
> 
>  	if (rdma_protocol_iwarp(&dev->ibdev, 1)) {
>  		rc = xa_insert(&dev->qps, qp->qp_id, qp, GFP_KERNEL);
>  		if (rc)
> -			goto err;
> +			goto out_free_qp_resources;
>  	}
> 
>  	return &qp->ibqp;
> 
> -err:
> +out_free_qp_resources:
> +	qedr_free_qp_resources(dev, qp, udata);
> +out_free_qp:
>  	kfree(qp);
> 
>  	return ERR_PTR(-EFAULT);
> @@ -2671,28 +2695,6 @@ int qedr_query_qp(struct ib_qp *ibqp,
>  	return rc;
>  }
> 
> -static int qedr_free_qp_resources(struct qedr_dev *dev, struct qedr_qp
> *qp,
> -				  struct ib_udata *udata)
> -{
> -	struct qedr_ucontext *ctx =
> -		rdma_udata_to_drv_context(udata, struct qedr_ucontext,
> -					  ibucontext);
> -	int rc;
> -
> -	if (qp->qp_type != IB_QPT_GSI) {
> -		rc = dev->ops->rdma_destroy_qp(dev->rdma_ctx, qp-
> >qed_qp);
> -		if (rc)
> -			return rc;
> -	}
> -
> -	if (qp->create_type == QEDR_QP_CREATE_USER)
> -		qedr_cleanup_user(dev, ctx, qp);
> -	else
> -		qedr_cleanup_kernel(dev, qp);
> -
> -	return 0;
> -}
> -
>  int qedr_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)  {
>  	struct qedr_qp *qp = get_qedr_qp(ibqp);
> --
> 2.17.1

Thanks, 

Acked-by: Michal Kalderon <michal.kalderon@...vell.com>