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 <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Wed May 31 09:13:34 JST 2017 From: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx> Date: Wed, 10 May 2017 19:07:53 +0200 Subject: s390/qeth: avoid null pointer dereference on OSN From: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx> [ Upstream commit 25e2c341e7818a394da9abc403716278ee646014 ] Access card->dev only after checking whether's its valid. Signed-off-by: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx> Reviewed-by: Ursula Braun <ubraun@xxxxxxxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/s390/net/qeth_l2_main.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) --- a/drivers/s390/net/qeth_l2_main.c +++ b/drivers/s390/net/qeth_l2_main.c @@ -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 jwi@xxxxxxxxxxxxxxxxxx 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