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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-11-05 20:56:46 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-05 22:34:21 -0800 |
| commit | 40c9c31e388bfd513269df737f874d0cd53c1616 (patch) | |
| tree | 0662514dcdd011f6f173723d01b53d1190e530df | |
| parent | 122ec6ffca3967ffaa96a4c7a5dc9cd71866e0bc (diff) | |
| download | op-kernel-dev-40c9c31e388bfd513269df737f874d0cd53c1616.zip op-kernel-dev-40c9c31e388bfd513269df737f874d0cd53c1616.tar.gz | |
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>
| -rw-r--r-- | net/sctp/ipv6.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index bacd6a7..cc50fbe 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -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; } |
