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macsec: RXSAs don't need to hold a reference on RXSCs

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Following the previous patch, RXSCs are held and properly refcounted in
the RX path (instead of being implicitly held by their SA), so the SA
doesn't need to hold a reference on its parent RXSC.

This also avoids panics on module unload caused by the double layer of
RCU callbacks (call_rcu frees the RXSA, which puts the final reference
on the RXSC and allows to free it in its own call_rcu) that commit
b196c22af5 ("macsec: add rcu_barrier() on module exit") didn't
protect against.
There were also some refcounting bugs in macsec_add_rxsa where I didn't
put the reference on the RXSC on the error paths, which would lead to
memory leaks.

Fixes: c09440f7dc ("macsec: introduce IEEE 802.1AE driver")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sabrina Dubroca 2016-07-29 15:37:54 +02:00 committed by David S. Miller
parent c78ebe1df0
commit 36b232c880
1 changed files with 1 additions and 2 deletions
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3
drivers/net/macsec.c
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@ -344,7 +344,6 @@ static void free_rxsa(struct rcu_head *head)
crypto_free_aead(sa->key.tfm);
free_percpu(sa->stats);
macsec_rxsc_put(sa->sc);
kfree(sa);
}
@ -1653,7 +1652,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
rtnl_lock();
rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}