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sctp: ipv6: avoid touching device refcount 

Avoid touching device refcount in sctp/ipv6, thanks to RCU

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-11-05 20:56:46 -08:00 committed by David S. Miller
parent 122ec6ffca
commit 40c9c31e38
1 changed files with 11 additions and 8 deletions
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19
net/sctp/ipv6.c
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@ -837,15 +837,16 @@ static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
if (type & IPV6_ADDR_LINKLOCAL) {
if (!addr->v6.sin6_scope_id)
return 0;
dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
if (!dev)
return 0;
if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
rcu_read_lock();
dev = dev_get_by_index_rcu(&init_net,
addr->v6.sin6_scope_id);
if (!dev ||
!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
dev, 0)) {
dev_put(dev);
rcu_read_unlock();
return 0;
}
dev_put(dev);
rcu_read_unlock();
} else if (type == IPV6_ADDR_MAPPED) {
if (!opt->v4mapped)
return 0;
@ -873,10 +874,12 @@ static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
if (type & IPV6_ADDR_LINKLOCAL) {
if (!addr->v6.sin6_scope_id)
return 0;
dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
rcu_read_lock();
dev = dev_get_by_index_rcu(&init_net,
addr->v6.sin6_scope_id);
rcu_read_unlock();
if (!dev)
return 0;
dev_put(dev);
}
af = opt->pf->af;
}