Patch "i40iw: Receive netdev events post INET_NOTIFIER state" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

i40iw: Receive netdev events post INET_NOTIFIER state

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
i40iw-receive-netdev-events-post-inet_notifier-state.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Shiraz Saleem <[email protected]>
Date: Fri, 17 Mar 2017 18:30:07 -0500
Subject: i40iw: Receive netdev events post INET_NOTIFIER state

From: Shiraz Saleem <[email protected]>

[ Upstream commit 871a8623d3b40221ad1103aff715dfee0aa4dacf ]

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.

---
 drivers/infiniband/hw/i40iw/i40iw_utils.c |    8 ++++++++
 1 file changed, 8 insertions(+)

@@ -159,6 +159,9 @@ int i40iw_inetaddr_event(struct 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)

@@ -231,6 +234,9 @@ int i40iw_inet6addr_event(struct notifie
 		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;

@@ -280,6 +286,8 @@ int i40iw_net_event(struct notifier_bloc
 		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) {

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/i40iw-receive-netdev-events-post-inet_notifier-state.patch