IB/mlx5: Fix NULL pointer dereference on debug print

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@mellanox.com>
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 304e39fd3c91dfe67d67f3bfc1d708395e45f5a8..19d590d3948477d97d7f8ed6ea89882b65841e14 100644 (file)
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -2037,8 +2037,8 @@ struct ib_qp *mlx5_ib_create_qp(struct ib_pd *pd,
 
                mlx5_ib_dbg(dev, "ib qpnum 0x%x, mlx qpn 0x%x, rcqn 0x%x, scqn 0x%x\n",
                            qp->ibqp.qp_num, qp->trans_qp.base.mqp.qpn,
-                           to_mcq(init_attr->recv_cq)->mcq.cqn,
-                           to_mcq(init_attr->send_cq)->mcq.cqn);
+                           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->trans_qp.xrcdn = xrcdn;