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| author | Ben Greear <greearb@candelatech.com> | 2011-06-01 07:18:52 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-06-05 14:16:28 -0700 |
| commit | 160ff18a07f3a505d452dcced8e45ecdd0a85506 (patch) | |
| tree | 68faa9997e62de66cfc0f06ed744737443345c7f | |
| parent | e990b37b906b6137d353ef2a918e15e5763d70ec (diff) | |
| download | linux-160ff18a07f3a505d452dcced8e45ecdd0a85506.tar.gz linux-160ff18a07f3a505d452dcced8e45ecdd0a85506.tar.bz2 linux-160ff18a07f3a505d452dcced8e45ecdd0a85506.zip | |
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.c | 14 |
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); |