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@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>

diff --git a/drivers/net/ethernet/ibm/ehea/ehea_main.c b/drivers/net/ethernet/ibm/ehea/ehea_main.c
index 297f0b6..bba48c8 100644 (file)
--- a/drivers/net/ethernet/ibm/ehea/ehea_main.c
+++ b/drivers/net/ethernet/ibm/ehea/ehea_main.c
@@ -1157,16 +1157,15 @@ 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);