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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index efbcfdc12796..dad7bc4878e0 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -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;