netdev - [PATCH net] tcp: use correct req pointer in tcp_move

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Date:	Thu, 05 Nov 2015 12:50:19 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, Ying Cai <ycai@...gle.com>
Subject: [PATCH net] tcp: use correct req pointer in tcp_move_syn() calls

From: Eric Dumazet <edumazet@...gle.com>

I mistakenly took wrong request sock pointer when calling tcp_move_syn()

@req_unhash is either a copy of @req, or a NULL value for
FastOpen connexions (as we do not expect to unhash the temporary
request sock from ehash table)

Fixes: 805c4bc05705 ("tcp: fix req->saved_syn race")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Ying Cai <ycai@...gle.com>
---
 net/ipv4/tcp_ipv4.c |    2 +-
 net/ipv6/tcp_ipv6.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 59aff63b1776..950e28c0cdf2 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1327,7 +1327,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
 		goto put_and_exit;
 	*own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
 	if (*own_req)
-		tcp_move_syn(newtp, req_unhash);
+		tcp_move_syn(newtp, req);
 
 	return newsk;
 
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index c509e5562429..5baa8e754e41 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1141,7 +1141,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
 	}
 	*own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
 	if (*own_req) {
-		tcp_move_syn(newtp, req_unhash);
+		tcp_move_syn(newtp, req);
 
 		/* Clone pktoptions received with SYN, if we own the req */
 		if (ireq->pktopts) {


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