linux-kernel - [PATCH 4.2.y-ckt 125/211] ipv4: Fix ip_local_out_sk by passing the sk into __ip_local_out

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Message-Id: <1452023119-25647-126-git-send-email-kamal@canonical.com>
Date:	Tue,  5 Jan 2016 11:43:53 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 125/211] ipv4: Fix ip_local_out_sk by passing the sk into __ip_local_out_sk

4.2.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

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

From: "Eric W. Biederman" <ebiederm@...ssion.com>

commit fd2874b3bbe832e90ac480971a7a8bd736b629b9 upstream.

In the rare case where sk != skb->sk ip_local_out_sk arranges
to call dst->output differently if the skb is queued or not.
This is a bug.

Fix this bug by passing the sk parameter of ip_local_out_sk through
from ip_local_out_sk to __ip_local_out_sk (skipping __ip_local_out).

Fixes: 7026b1ddb6b8 ("netfilter: Pass socket pointer down through okfn().")
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/ipv4/ip_output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 6bf89a6..f04d077 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -114,7 +114,7 @@ int ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
 {
 	int err;
 
-	err = __ip_local_out(skb);
+	err = __ip_local_out_sk(sk, skb);
 	if (likely(err == 1))
 		err = dst_output_sk(sk, skb);
 
-- 
1.9.1

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