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Commit 160ff18a authored by Ben Greear's avatar Ben Greear Committed by David S. Miller
Browse files

af-packet: Hold reference to bound network devices. 



Old code was probably safe, but with this change we
can actually use the netdev object, not just compare
the pointer values.

Signed-off-by: default avatarBen Greear <greearb@candelatech.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e990b37b

net/packet/af_packet.c

+9 −5
Original line number Diff line number Diff line
@@ -1342,6 +1342,10 @@ static int packet_release(struct socket *sock) 
		__dev_remove_pack(&po->prot_hook);

		__sock_put(sk);

	}

	if (po->prot_hook.dev) {

		dev_put(po->prot_hook.dev);

		po->prot_hook.dev = NULL;

	}

	spin_unlock(&po->bind_lock);



	packet_flush_mclist(sk);
@@ -1395,6 +1399,8 @@ static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protoc 


	po->num = protocol;

	po->prot_hook.type = protocol;

	if (po->prot_hook.dev)

		dev_put(po->prot_hook.dev);

	po->prot_hook.dev = dev;



	po->ifindex = dev ? dev->ifindex : 0;
@@ -1439,10 +1445,8 @@ static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, 
	strlcpy(name, uaddr->sa_data, sizeof(name));



	dev = dev_get_by_name(sock_net(sk), name);

	if (dev) {

	if (dev)

		err = packet_do_bind(sk, dev, pkt_sk(sk)->num);

		dev_put(dev);

	}

	return err;

}
@@ -1470,8 +1474,6 @@ static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len 
			goto out;

	}

	err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);

	if (dev)

		dev_put(dev);



out:

	return err;
@@ -2240,6 +2242,8 @@ static int packet_notifier(struct notifier_block *this, unsigned long msg, void 
				}

				if (msg == NETDEV_UNREGISTER) {

					po->ifindex = -1;

					if (po->prot_hook.dev)

						dev_put(po->prot_hook.dev);

					po->prot_hook.dev = NULL;

				}

				spin_unlock(&po->bind_lock);