macsec: fix reference counting on RXSC in macsec_handle_frame

Currently, we lookup the RXSC without taking a reference on it.  The
RXSA holds a reference on the RXSC, but the SA and SC could still both
disappear before we take a reference on the SA.

Take a reference on the RXSC in macsec_handle_frame.

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

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 2d0beb1..718cf98 100644 (file)
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -863,6 +863,7 @@ static void macsec_decrypt_done(struct crypto_async_request *base, int err)
        struct net_device *dev = skb->dev;
        struct macsec_dev *macsec = macsec_priv(dev);
        struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
+       struct macsec_rx_sc *rx_sc = rx_sa->sc;
        int len, ret;
        u32 pn;
 
@@ -891,6 +892,7 @@ static void macsec_decrypt_done(struct crypto_async_request *base, int err)
 
 out:
        macsec_rxsa_put(rx_sa);
+       macsec_rxsc_put(rx_sc);
        dev_put(dev);
 }
 
@@ -1106,6 +1108,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
 
        list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
                struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
+               sc = sc ? macsec_rxsc_get(sc) : NULL;
 
                if (sc) {
                        secy = &macsec->secy;
@@ -1180,8 +1183,10 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
 
        if (IS_ERR(skb)) {
                /* the decrypt callback needs the reference */
-               if (PTR_ERR(skb) != -EINPROGRESS)
+               if (PTR_ERR(skb) != -EINPROGRESS) {
                        macsec_rxsa_put(rx_sa);
+                       macsec_rxsc_put(rx_sc);
+               }
                rcu_read_unlock();
                *pskb = NULL;
                return RX_HANDLER_CONSUMED;
@@ -1197,6 +1202,7 @@ deliver:
 
        if (rx_sa)
                macsec_rxsa_put(rx_sa);
+       macsec_rxsc_put(rx_sc);
 
        ret = gro_cells_receive(&macsec->gro_cells, skb);
        if (ret == NET_RX_SUCCESS)
@@ -1212,6 +1218,7 @@ deliver:
 drop:
        macsec_rxsa_put(rx_sa);
 drop_nosa:
+       macsec_rxsc_put(rx_sc);
        rcu_read_unlock();
 drop_direct:
        kfree_skb(skb);