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tcp/dccp: fix potential NULL deref in __inet_inherit_port()

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As we no longer hold listener lock in fast path, it is possible that a
child is created right after listener freed its bound port, if a close()
is done while incoming packets are processed.

__inet_inherit_port() must detect this and return an error,
so that caller can free the child earlier.

Fixes: e994b2f0fb ("tcp: do not lock listener to process SYN packets")
Fixes: 079096f103 ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-14 05:58:38 -07:00 committed by David S. Miller
parent fb0801dcc1
commit c2f34a65a6
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/inet_hashtables.c
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@ -137,6 +137,10 @@ int __inet_inherit_port(const struct sock *sk, struct sock *child)
spin_lock(&head->lock);
tb = inet_csk(sk)->icsk_bind_hash;
if (unlikely(!tb)) {
spin_unlock(&head->lock);
return -ENOENT;
}
if (tb->port != port) {
/* NOTE: using tproxy and redirecting skbs to a proxy
* on a different listener port breaks the assumption