linux-kernel - [PATCH 3.16 243/306] IB/mlx5: Fix NULL pointer dereference on debug print

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Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Yishai Hadas" <yishaih@...lanox.com>,
        "Maor Gottlieb" <maorg@...lanox.com>,
        "Eli Cohen" <eli@...lanox.com>,
        "Leon Romanovsky" <leon@...nel.org>,
        "Doug Ledford" <dledford@...hat.com>
Subject: [PATCH 3.16 243/306] IB/mlx5: Fix NULL pointer dereference on
 debug print

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Eli Cohen <eli@...lanox.com>

commit a1ab8402d15d2305d2315d96ec3294bfdf16587e upstream.

For XRC QP CQs may not exist. Check before attempting dereference.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Eli Cohen <eli@...lanox.com>
Signed-off-by: Maor Gottlieb <maorg@...lanox.com>
Reviewed-by: Yishai Hadas <yishaih@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Doug Ledford <dledford@...hat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -1205,8 +1205,9 @@ struct ib_qp *mlx5_ib_create_qp(struct i
 			qp->ibqp.qp_num = qp->mqp.qpn;
 
 		mlx5_ib_dbg(dev, "ib qpnum 0x%x, mlx qpn 0x%x, rcqn 0x%x, scqn 0x%x\n",
-			    qp->ibqp.qp_num, qp->mqp.qpn, to_mcq(init_attr->recv_cq)->mcq.cqn,
-			    to_mcq(init_attr->send_cq)->mcq.cqn);
+			    qp->ibqp.qp_num, qp->mqp.qpn,
+			    init_attr->recv_cq ? to_mcq(init_attr->recv_cq)->mcq.cqn : -1,
+			    init_attr->send_cq ? to_mcq(init_attr->send_cq)->mcq.cqn : -1);
 
 		qp->xrcdn = xrcdn;