From 40c9c31e388bfd513269df737f874d0cd53c1616 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 5 Nov 2009 20:56:46 -0800 Subject: [PATCH] sctp: ipv6: avoid touching device refcount Avoid touching device refcount in sctp/ipv6, thanks to RCU Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/sctp/ipv6.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index bacd6a7318be..cc50fbe99291 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; } -- 2.20.1