Patch "s390/qeth: avoid null pointer dereference on OSN" 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

s390/qeth: avoid null pointer dereference on OSN

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:
s390-qeth-avoid-null-pointer-dereference-on-osn.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: Julian Wiedmann <[email protected]>
Date: Wed, 10 May 2017 19:07:53 +0200
Subject: s390/qeth: avoid null pointer dereference on OSN

From: Julian Wiedmann <[email protected]>

[ Upstream commit 25e2c341e7818a394da9abc403716278ee646014 ]

Access card->dev only after checking whether's its valid.

---
 drivers/s390/net/qeth_l2_main.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

@@ -1106,7 +1106,6 @@ static int qeth_l2_setup_netdev(struct q
 	case QETH_CARD_TYPE_OSN:
 		card->dev = alloc_netdev(0, "osn%d", NET_NAME_UNKNOWN,
 					 ether_setup);
-		card->dev->flags |= IFF_NOARP;
 		break;
 	default:
 		card->dev = alloc_etherdev(0);

@@ -1119,9 +1118,12 @@ static int qeth_l2_setup_netdev(struct q
 	card->dev->watchdog_timeo = QETH_TX_TIMEOUT;
 	card->dev->mtu = card->info.initial_mtu;
 	card->dev->netdev_ops = &qeth_l2_netdev_ops;
-	card->dev->ethtool_ops =
-		(card->info.type != QETH_CARD_TYPE_OSN) ?
-		&qeth_l2_ethtool_ops : &qeth_l2_osn_ops;
+	if (card->info.type == QETH_CARD_TYPE_OSN) {
+		card->dev->ethtool_ops = &qeth_l2_osn_ops;
+		card->dev->flags |= IFF_NOARP;
+	} else {
+		card->dev->ethtool_ops = &qeth_l2_ethtool_ops;
+	}
 	card->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 	if (card->info.type == QETH_CARD_TYPE_OSD && !card->info.guestlan) {
 		card->dev->hw_features = NETIF_F_SG;

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

queue-4.9/s390-qeth-unbreak-osm-and-osn-support.patch queue-4.9/s390-qeth-avoid-null-pointer-dereference-on-osn.patch queue-4.9/s390-qeth-handle-sysfs-error-during-initialization.patch queue-4.9/s390-qeth-add-missing-hash-table-initializations.patch