net: macsec: fix potential resource leak in macsec_add_rxsa() and macsec_add_txsa()

init_rx_sa() allocates relevant resource for rx_sa->stats and rx_sa->
key.tfm with alloc_percpu() and macsec_alloc_tfm(). When some error
occurs after init_rx_sa() is called in macsec_add_rxsa(), the function
released rx_sa with kfree() without releasing rx_sa->stats and rx_sa->
key.tfm, which will lead to a resource leak.

We should call macsec_rxsa_put() instead of kfree() to decrease the ref
count of rx_sa and release the relevant resource if the refcount is 0.
The same bug exists in macsec_add_txsa() for tx_sa as well. This patch
fixes the above two bugs.

Fixes: 3cf3227a21d1 ("net: macsec: hardware offloading infrastructure")
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 95578f0..f354fad 100644 (file)
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1844,7 +1844,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
        return 0;
 
 cleanup:
-       kfree(rx_sa);
+       macsec_rxsa_put(rx_sa);
        rtnl_unlock();
        return err;
 }
@@ -2087,7 +2087,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 
 cleanup:
        secy->operational = was_operational;
-       kfree(tx_sa);
+       macsec_txsa_put(tx_sa);
        rtnl_unlock();
        return err;
 }