[4.2.y-ckt stable] Patch "net: ehea: avoid null pointer dereference" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    net: ehea: avoid null pointer dereference

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    https://git.launchpad.net/~canonical-kernel/linux/+git/linux-stable-ckt/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt12.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From f9c9cce8159575abe64dd1ce381f39742169e659 Mon Sep 17 00:00:00 2001
From: "xypron.glpk at gmx.de" <xypron.glpk at gmx.de>
Date: Tue, 17 May 2016 22:28:54 +0200
Subject: net: ehea: avoid null pointer dereference

commit 1740c29a46b30a2f157afc473156f157e599d4c2 upstream.

ehea_get_port may return NULL. Do not dereference NULL value.

Fixes: 8c4877a4128e ("ehea: Use the standard logging functions")
Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo at debian.org>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/net/ethernet/ibm/ehea/ehea_main.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ehea/ehea_main.c b/drivers/net/ethernet/ibm/ehea/ehea_main.c
index 2a0dc12..54efa9a 100644
--- a/drivers/net/ethernet/ibm/ehea/ehea_main.c
+++ b/drivers/net/ethernet/ibm/ehea/ehea_main.c
@@ -1169,16 +1169,15 @@ static void ehea_parse_eqe(struct ehea_adapter *adapter, u64 eqe)
 	ec = EHEA_BMASK_GET(NEQE_EVENT_CODE, eqe);
 	portnum = EHEA_BMASK_GET(NEQE_PORTNUM, eqe);
 	port = ehea_get_port(adapter, portnum);
+	if (!port) {
+		netdev_err(NULL, "unknown portnum %x\n", portnum);
+		return;
+	}
 	dev = port->netdev;

 	switch (ec) {
 	case EHEA_EC_PORTSTATE_CHG:	/* port state change */

-		if (!port) {
-			netdev_err(dev, "unknown portnum %x\n", portnum);
-			break;
-		}
-
 		if (EHEA_BMASK_GET(NEQE_PORT_UP, eqe)) {
 			if (!netif_carrier_ok(dev)) {
 				ret = ehea_sense_port_attr(port);
--
2.7.4