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From:   Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
Cc:     keitasuzuki.park@sslab.ics.keio.ac.jp,
        takafumi@sslab.ics.keio.ac.jp,
        Michal Kalderon <mkalderon@marvell.com>,
        Ariel Elior <aelior@marvell.com>,
        Doug Ledford <dledford@redhat.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Yuval Bason <yuval.bason@cavium.com>,
        linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] qedr: fix resource leak in qedr_create_qp
Date:   Wed,  9 Sep 2020 16:55:59 +0000
Message-Id: <20200909165600.20556-1-keitasuzuki.park@sslab.ics.keio.ac.jp>
To:     unlisted-recipients:; (no To-header on input)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@sslab.ics.keio.ac.jp>
---
 drivers/infiniband/hw/qedr/verbs.c | 48 ++++++++++++++++--------------
 1 file changed, 25 insertions(+), 23 deletions(-)

diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index b49bef94637e..19688773c58b 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)
@@ -2165,11 +2187,13 @@ struct ib_qp *qedr_create_qp(struct ib_pd *ibpd,
 	if (rdma_protocol_iwarp(&dev->ibdev, 1)) {
 		rc = xa_insert(&dev->qps, qp->qp_id, qp, GFP_KERNEL);
 		if (rc)
-			goto err;
+			goto err2;
 	}
 
 	return &qp->ibqp;
 
+err2:
+	qedr_free_qp_resources(dev, qp, udata);
 err:
 	kfree(qp);
 
@@ -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