[PATCH 3.16 106/305] net: ehea: avoid null pointer dereference

Ben Hutchings
2016-08-14T11:08:37Z

From: "xypron.glpk@gmx.de" <xypron.glpk@gmx.de>

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@gmx.de>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/net/ethernet/ibm/ehea/ehea_main.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

--- 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_a
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);