netdev - [PATCH net] tcp: remove buggy call to tcp_v6_restore

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Message-ID: <1512006237.19682.6.camel@gmail.com>
Date:   Wed, 29 Nov 2017 17:43:57 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Subject: [PATCH net] tcp: remove buggy call to tcp_v6_restore_cb()

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

tcp_v6_send_reset() expects to receive an skb with skb->cb[] layout as
used in TCP stack.
MD5 lookup uses tcp_v6_iif() and tcp_v6_sdif() and thus
TCP_SKB_CB(skb)->header.h6

This patch probably fixes RST packets sent on behalf of a timewait md5
ipv6 socket.

Before Florian patch, tcp_v6_restore_cb() was needed before jumping to
no_tcp_socket label.

Fixes: 271c3b9b7bda ("tcp: honour SO_BINDTODEVICE for TW_RST case too")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Florian Westphal <fw@...len.de>
---
 net/ipv6/tcp_ipv6.c |    1 -
 1 file changed, 1 deletion(-)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 6bb98c93edfe2ed2f16fe5229605f8108cfc7f9a..be11dc13aa705145a83177e17d23594e9416e11a 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1590,7 +1590,6 @@ static int tcp_v6_rcv(struct sk_buff *skb)
 		tcp_v6_timewait_ack(sk, skb);
 		break;
 	case TCP_TW_RST:
-		tcp_v6_restore_cb(skb);
 		tcp_v6_send_reset(sk, skb);
 		inet_twsk_deschedule_put(inet_twsk(sk));
 		goto discard_it;