linux-kernel - [PATCH 4.2 15/54] act_mirred: clear sender cpu before sending to tx

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Date:	Fri, 23 Oct 2015 10:44:51 -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, Eric Dumazet <edumazet@...gle.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <cwang@...pensource.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.2 15/54] act_mirred: clear sender cpu before sending to tx

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

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

From: WANG Cong <xiyou.wangcong@...il.com>

[ Upstream commit d40496a56430eac0d330378816954619899fe303 ]

Similar to commit c29390c6dfee ("xps: must clear sender_cpu before forwarding")
the skb->sender_cpu needs to be cleared when moving from Rx
Tx, otherwise kernel could crash.

Fixes: 2bd82484bb4c ("xps: fix xps for stacked devices")
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Cong Wang <cwang@...pensource.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
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/sched/act_mirred.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -168,6 +168,7 @@ static int tcf_mirred(struct sk_buff *sk
 
 	skb2->skb_iif = skb->dev->ifindex;
 	skb2->dev = dev;
+	skb_sender_cpu_clear(skb2);
 	err = dev_queue_xmit(skb2);
 
 out:


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