macsec: fix memory leaks around rx_handler (un)registration

We leak a struct macsec_rxh_data when we unregister the rx_handler in
macsec_dellink.
We also leak a struct macsec_rxh_data in register_macsec_dev if we fail
to register the rx_handler.

Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 41fbe55..826c6c9 100644 (file)
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -2931,8 +2931,10 @@ static void macsec_dellink(struct net_device *dev, struct list_head *head)
 
        unregister_netdevice_queue(dev, head);
        list_del_rcu(&macsec->secys);
-       if (list_empty(&rxd->secys))
+       if (list_empty(&rxd->secys)) {
                netdev_rx_handler_unregister(real_dev);
+               kfree(rxd);
+       }
 
        macsec_del_dev(macsec);
 }
@@ -2954,8 +2956,10 @@ static int register_macsec_dev(struct net_device *real_dev,
 
                err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
                                                 rxd);
-               if (err < 0)
+               if (err < 0) {
+                       kfree(rxd);
                        return err;
+               }
        }
 
        list_add_tail_rcu(&macsec->secys, &rxd->secys);