linux-kernel - [PATCH 4.1 123/159] bridge: fix potential crash in __netdev_pick

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Date:	Sat, 26 Sep 2015 13:56:09 -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>,
	Bob Liu <bob.liu@...cle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.1 123/159] bridge: fix potential crash in __netdev_pick_tx()

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

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

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

[ Upstream commit a7d35f9d73e9ffa74a02304b817e579eec632f67 ]

Commit c29390c6dfee ("xps: must clear sender_cpu before forwarding")
fixed an issue in normal forward path, caused by sender_cpu & napi_id
skb fields being an union.

Bridge is another point where skb can be forwarded, so we need
the same cure.

Bug triggers if packet was received on a NIC using skb_mark_napi_id()

Fixes: 2bd82484bb4c ("xps: fix xps for stacked devices")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Bob Liu <bob.liu@...cle.com>
Tested-by: Bob Liu <bob.liu@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/bridge/br_forward.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -42,6 +42,7 @@ int br_dev_queue_push_xmit(struct sock *
 	} else {
 		skb_push(skb, ETH_HLEN);
 		br_drop_fake_rtable(skb);
+		skb_sender_cpu_clear(skb);
 		dev_queue_xmit(skb);
 	}
 


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