linux-kernel - [ 073/122] qeth: repair crash in qeth_l3_vlan_rx_kill

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Message-Id: <20120807221955.209920962@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:26:01 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ursula Braun <ursula.braun@...ibm.com>,
	Frank Blaschka <frank.blaschka@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 073/122] qeth: repair crash in qeth_l3_vlan_rx_kill_vid()

From: Greg KH <gregkh@...uxfoundation.org>

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

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

From: Frank Blaschka <frank.blaschka@...ibm.com>

commit eabfbe6230ee7363681e7a561948d362b87169f0 upstream.

Commit efc73f4b "net: Fix memory leak - vlan_info struct" adds deletion of
VLAN 0 for devices with feature NETIF_F_HW_VLAN_FILTER. For driver
qeth these are the layer 3 devices. Usually there exists no
separate vlan net_device for VLAN 0. Thus the qeth functions
qeth_l3_free_vlan_addresses4() and qeth_l3_free_vlan_addresses6()
require an extra checking if function __vlan_find_dev_deep()
returns with a net_device.

Signed-off-by: Ursula Braun <ursula.braun@...ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@...ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/s390/net/qeth_l3_main.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1760,6 +1760,8 @@ static void qeth_l3_free_vlan_addresses4
 	QETH_CARD_TEXT(card, 4, "frvaddr4");

 	netdev = __vlan_find_dev_deep(card->dev, vid);
+	if (!netdev)
+		return;
 	in_dev = in_dev_get(netdev);
 	if (!in_dev)
 		return;
@@ -1788,6 +1790,8 @@ static void qeth_l3_free_vlan_addresses6
 	QETH_CARD_TEXT(card, 4, "frvaddr6");

 	netdev = __vlan_find_dev_deep(card->dev, vid);
+	if (!netdev)
+		return;
 	in6_dev = in6_dev_get(netdev);
 	if (!in6_dev)
 		return;

--
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