linux-kernel - [ 28/42] ipv6/tcp: Stop processing ICMPv6 redirect messages

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Message-Id: <20130429184755.580448511@linuxfoundation.org>
Date:	Mon, 29 Apr 2013 12:02:10 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tetja Rediske <tetja@...ja.de>,
	Christoph Paasch <christoph.paasch@...ouvain.be>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 28/42] ipv6/tcp: Stop processing ICMPv6 redirect messages

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Paasch <christoph.paasch@...ouvain.be>

[ Upstream commit 50a75a8914539c5dcd441c5f54d237a666a426fd ]

Tetja Rediske found that if the host receives an ICMPv6 redirect message
after sending a SYN+ACK, the connection will be reset.

He bisected it down to 093d04d (ipv6: Change skb->data before using
icmpv6_notify() to propagate redirect), but the origin of the bug comes
from ec18d9a26 (ipv6: Add redirect support to all protocol icmp error
handlers.). The bug simply did not trigger prior to 093d04d, because
skb->data did not point to the inner IP header and thus icmpv6_notify
did not call the correct err_handler.

This patch adds the missing "goto out;" in tcp_v6_err. After receiving
an ICMPv6 Redirect, we should not continue processing the ICMP in
tcp_v6_err, as this may trigger the removal of request-socks or setting
sk_err(_soft).

Reported-by: Tetja Rediske <tetja@...ja.de>
Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/tcp_ipv6.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -386,6 +386,7 @@ static void tcp_v6_err(struct sk_buff *s

 		if (dst)
 			dst->ops->redirect(dst, sk, skb);
+		goto out;
 	}

 	if (type == ICMPV6_PKT_TOOBIG) {

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