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>
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@ -837,15 +837,16 @@ static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
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if (type & IPV6_ADDR_LINKLOCAL) {
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if (!addr->v6.sin6_scope_id)
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return 0;
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dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
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if (!dev)
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return 0;
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if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
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rcu_read_lock();
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dev = dev_get_by_index_rcu(&init_net,
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addr->v6.sin6_scope_id);
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if (!dev ||
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!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
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dev, 0)) {
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dev_put(dev);
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rcu_read_unlock();
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return 0;
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}
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dev_put(dev);
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rcu_read_unlock();
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} else if (type == IPV6_ADDR_MAPPED) {
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if (!opt->v4mapped)
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return 0;
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@ -873,10 +874,12 @@ static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
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if (type & IPV6_ADDR_LINKLOCAL) {
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if (!addr->v6.sin6_scope_id)
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return 0;
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dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id);
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rcu_read_lock();
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dev = dev_get_by_index_rcu(&init_net,
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addr->v6.sin6_scope_id);
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rcu_read_unlock();
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if (!dev)
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return 0;
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dev_put(dev);
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}
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af = opt->pf->af;
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}
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