[PATCH rdma-rc 1/2] RDMA/ionic: Fix potential NULL pointer dereference in ionic_query_device

[Kamal Heib <kheib@redhat.com>]

The function ionic_query_device() calls ib_device_get_netdev() without
checking the return value which could lead to NULL pointer dereference,
Fix it by checking the return value and return -ENODEV if the 'ndev' is
NULL.

Fixes: 2075bbe8ef03 ("RDMA/ionic: Register device ops for miscellaneous functionality")
Signed-off-by: Kamal Heib <kheib@redhat.com>
---
 drivers/infiniband/hw/ionic/ionic_ibdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/hw/ionic/ionic_ibdev.c b/drivers/infiniband/hw/ionic/ionic_ibdev.c
index b0449c75f893..8614546b2558 100644
--- a/drivers/infiniband/hw/ionic/ionic_ibdev.c
+++ b/drivers/infiniband/hw/ionic/ionic_ibdev.c
@@ -32,6 +32,9 @@ static int ionic_query_device(struct ib_device *ibdev,
 		return err;
 
 	ndev = ib_device_get_netdev(ibdev, 1);
+	if (!ndev)
+		return -ENODEV;
+
 	addrconf_ifid_eui48((u8 *)&attr->sys_image_guid, ndev);
 	dev_put(ndev);
 	attr->max_mr_size = dev->lif_cfg.npts_per_lif * PAGE_SIZE / 2;
-- 
2.55.0