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authorEric Dumazet <eric.dumazet@gmail.com>2009-12-04 03:46:54 +0000
committerDavid S. Miller <davem@davemloft.net>2009-12-08 20:17:51 -0800
commit9327f7053e3993c125944fdb137a0618319ef2a0 (patch)
tree3cee7de049a2468bef930b1832c42bd1b2e69e9a /net/ipv6
parent74757d49016a8b06ca028196886641d7aeb78de5 (diff)
tcp: Fix a connect() race with timewait sockets
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 <kdakhane@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/inet6_hashtables.c8
-rw-r--r--net/ipv6/tcp_ipv6.c4
2 files changed, 9 insertions, 3 deletions
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index c813e294ec0..633a6c26613 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -22,9 +22,10 @@
#include <net/inet6_hashtables.h>
#include <net/ip.h>
-void __inet6_hash(struct sock *sk)
+int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
+ int twrefcnt = 0;
WARN_ON(!sk_unhashed(sk));
@@ -45,10 +46,15 @@ void __inet6_hash(struct sock *sk)
lock = inet_ehash_lockp(hashinfo, hash);
spin_lock(lock);
__sk_nulls_add_node_rcu(sk, list);
+ if (tw) {
+ WARN_ON(sk->sk_hash != tw->tw_hash);
+ twrefcnt = inet_twsk_unhash(tw);
+ }
spin_unlock(lock);
}
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+ return twrefcnt;
}
EXPORT_SYMBOL(__inet6_hash);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index aadd7cef73b..ee9cf62458d 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -96,7 +96,7 @@ static void tcp_v6_hash(struct sock *sk)
return;
}
local_bh_disable();
- __inet6_hash(sk);
+ __inet6_hash(sk, NULL);
local_bh_enable();
}
}
@@ -1496,7 +1496,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
}
#endif
- __inet6_hash(newsk);
+ __inet6_hash(newsk, NULL);
__inet_inherit_port(sk, newsk);
return newsk;