i40iw: Receive netdev events post INET_NOTIFIER state

Netdev notification events are de-registered only when all
client iwdev instances are removed. If a single client is closed
and re-opened, netdev events could arrive even before the Control
Queue-Pair (CQP) is created, causing a NULL pointer dereference crash
in i40iw_get_cqp_request. Fix this by allowing netdev event
notification only after we have reached the INET_NOTIFIER state with
respect to device initialization.

Reported-by: Stefan Assmann <sassmann@redhat.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/i40iw/i40iw_utils.c b/drivers/infiniband/hw/i40iw/i40iw_utils.c
index 0f5d43d1f5fc..70c3e9e79508 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_utils.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_utils.c
@@ -160,6 +160,9 @@ int i40iw_inetaddr_event(struct notifier_block *notifier,
                 return NOTIFY_DONE;
 
         iwdev = &hdl->device;
+        if (iwdev->init_state < INET_NOTIFIER)
+                return NOTIFY_DONE;
+
         netdev = iwdev->ldev->netdev;
         upper_dev = netdev_master_upper_dev_get(netdev);
         if (netdev != event_netdev)
@@ -214,6 +217,9 @@ int i40iw_inet6addr_event(struct notifier_block *notifier,
                 return NOTIFY_DONE;
 
         iwdev = &hdl->device;
+        if (iwdev->init_state < INET_NOTIFIER)
+                return NOTIFY_DONE;
+
         netdev = iwdev->ldev->netdev;
         if (netdev != event_netdev)
                 return NOTIFY_DONE;
@@ -260,6 +266,8 @@ int i40iw_net_event(struct notifier_block *notifier, unsigned long event, void *
                 if (!iwhdl)
                         return NOTIFY_DONE;
                 iwdev = &iwhdl->device;
+                if (iwdev->init_state < INET_NOTIFIER)
+                        return NOTIFY_DONE;
                 p = (__be32 *)neigh->primary_key;
                 i40iw_copy_ip_ntohl(local_ipaddr, p);
                 if (neigh->nud_state & NUD_VALID) {