linux-kernel - [ 48/61] ipv4: Fix route refcount on pmtu discovery

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Message-Id: <20130212203424.452624921@linuxfoundation.org>
Date:	Tue, 12 Feb 2013 12:35:08 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Julian Anastasov <ja@....bg>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 48/61] ipv4: Fix route refcount on pmtu discovery

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

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


From: Steffen Klassert <steffen.klassert@...unet.com>

[ Upstream commit b44108dbdbaa07c609bb5755e8dd6c2035236251 ]

git commit 9cb3a50c (ipv4: Invalidate the socket cached route on
pmtu events if possible) introduced a refcount problem. We don't
get a refcount on the route if we get it from__sk_dst_get(), but
we need one if we want to reuse this route because __sk_dst_set()
releases the refcount of the old route. This patch adds proper
refcount handling for that case. We introduce a 'new' flag to
indicate that we are going to use a new route and we release the
old route only if we replace it by a new one.

Reported-by: Julian Anastasov <ja@....bg>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/route.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -985,6 +985,7 @@ void ipv4_sk_update_pmtu(struct sk_buff
 	struct flowi4 fl4;
 	struct rtable *rt;
 	struct dst_entry *dst;
+	bool new = false;
 
 	bh_lock_sock(sk);
 	rt = (struct rtable *) __sk_dst_get(sk);
@@ -1000,20 +1001,26 @@ void ipv4_sk_update_pmtu(struct sk_buff
 		rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
 		if (IS_ERR(rt))
 			goto out;
+
+		new = true;
 	}
 
 	__ip_rt_update_pmtu((struct rtable *) rt->dst.path, &fl4, mtu);
 
 	dst = dst_check(&rt->dst, 0);
 	if (!dst) {
+		if (new)
+			dst_release(&rt->dst);
+
 		rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
 		if (IS_ERR(rt))
 			goto out;
 
-		dst = &rt->dst;
+		new = true;
 	}
 
-	 __sk_dst_set(sk, dst);
+	if (new)
+		__sk_dst_set(sk, &rt->dst);
 
 out:
 	bh_unlock_sock(sk);


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