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authorBen Greear <greearb@candelatech.com>2011-06-01 07:18:52 +0000
committerDavid S. Miller <davem@davemloft.net>2011-06-05 14:16:28 -0700
commit160ff18a07f3a505d452dcced8e45ecdd0a85506 (patch)
tree68faa9997e62de66cfc0f06ed744737443345c7f
parente990b37b906b6137d353ef2a918e15e5763d70ec (diff)
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: Ben Greear <greearb@candelatech.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/packet/af_packet.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index ba248d93399a..636b75c15a63 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -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);