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Groups > linux.kernel > #1657991

[PATCH 4.9 06/94] s390/qeth: avoid null pointer dereference on OSN

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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julian Wiedmann <jwi@linux.vnet.ibm.com>


[ Upstream commit 25e2c341e7818a394da9abc403716278ee646014 ]

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

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 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;

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[PATCH 4.9 00/94] 4.9.31-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 14/94] net/packet: fix missing net_device reference release Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 05/94] s390/qeth: unbreak OSM and OSN support Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 18/94] net: Improve handling of failures on link and route dumps Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 15/94] net/mlx5e: Use the correct pause values for ethtool advertising Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 30/94] virtio-net: enable TSO/checksum offloads for Q-in-Q vlans Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 08/94] bpf, arm64: fix faulty emission of map access in tail calls Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 29/94] be2net: Fix offload features for Q-in-Q packets Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 16/94] net/mlx5e: Fix ethtool pause support and advertise reporting Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 13/94] sctp: do not inherit ipv6_{mc|ac|fl}_list from parent Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 17/94] tcp: eliminate negative reordering in tcp_clean_rtx_queue Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 06/94] s390/qeth: avoid null pointer dereference on OSN Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 20/94] ipv6: Check ip6_find_1stfragopt() return value properly. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  [PATCH 4.9 12/94] sctp: fix src address selection if using secondary addresses for ipv6 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:20 +0200
  Re: [PATCH 4.9 00/94] 4.9.31-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2017-06-05 22:40 +0200
  Re: [PATCH 4.9 00/94] 4.9.31-stable review Guenter Roeck <linux@roeck-us.net> - 2017-06-06 00:30 +0200

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