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

[Kamal Heib <kheib@redhat.com>]

The ionic_lif_netdev() function can return NULL if lif->netdev is not set,
but the caller in ionic_create_ibdev() was not checking for this before
dereferencing the returned pointer in addrconf_ifid_eui48().

Add a NULL check after calling ionic_lif_netdev() and return -ENODEV if
no netdev is available.

Fixes: 8d765af51a09 ("RDMA/ionic: Register auxiliary module for ionic ethernet adapter")
Signed-off-by: Kamal Heib <kheib@redhat.com>
---
 drivers/infiniband/hw/ionic/ionic_ibdev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/infiniband/hw/ionic/ionic_ibdev.c b/drivers/infiniband/hw/ionic/ionic_ibdev.c
index 8614546b2558..c738eb5be085 100644
--- a/drivers/infiniband/hw/ionic/ionic_ibdev.c
+++ b/drivers/infiniband/hw/ionic/ionic_ibdev.c
@@ -348,6 +348,11 @@ static struct ionic_ibdev *ionic_create_ibdev(struct ionic_aux_dev *ionic_adev)
 	ibdev->num_comp_vectors = dev->lif_cfg.eq_count - 2;
 
 	ndev = ionic_lif_netdev(ionic_adev->lif);
+	if (!ndev) {
+		rc = -ENODEV;
+		goto err_admin;
+	}
+
 	addrconf_ifid_eui48((u8 *)&ibdev->node_guid, ndev);
 	rc = ib_device_set_netdev(ibdev, ndev, 1);
 	/* ionic_lif_netdev() returns ndev with refcount held */
-- 
2.55.0