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tcp: Fix a connect() race with timewait sockets

Browse source 
First patch changes __inet_hash_nolisten() and __inet6_hash()
to get a timewait parameter to be able to unhash it from ehash
at same time the new socket is inserted in hash.

This makes sure timewait socket wont be found by a concurrent
writer in __inet_check_established()

Reported-by: kapil dakhane <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2009-12-04 03:46:54 +00:00 • committed by David S. Miller
commit 9327f7053e
8 changed files with 35 additions and 17 deletions
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2
net/dccp/ipv4.c
View file

@ -408,7 +408,7 @@ struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb,
dccp_sync_mss(newsk, dst_mtu(dst));
__inet_hash_nolisten(newsk);
__inet_hash_nolisten(newsk, NULL);
__inet_inherit_port(sk, newsk);
return newsk;

4
net/dccp/ipv6.c
View file

@ -46,7 +46,7 @@ static void dccp_v6_hash(struct sock *sk)
return;
}
local_bh_disable();
__inet6_hash(sk);
__inet6_hash(sk, NULL);
local_bh_enable();
}
}
@ -644,7 +644,7 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
__inet6_hash(newsk);
__inet6_hash(newsk, NULL);
__inet_inherit_port(sk, newsk);
return newsk;