netdev - [PATCH] macvlan: fix panic if lowerdev in a bond

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Date:	Fri, 20 May 2011 18:44:49 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, Patrick McHardy <kaber@...sh.net>,
	Jiri Pirko <jpirko@...hat.com>
Subject: [PATCH] macvlan: fix panic if lowerdev in a bond

commit a35e2c1b6d905 (macvlan: use rx_handler_data pointer to store
macvlan_port pointer V2) added a bug in macvlan_port_create()

Steps to reproduce the bug:

# ifenslave bond0 eth0 eth1

# ip link add link eth0 up name eth0#1 type macvlan
->error EBUSY

# ip link add link eth0 up name eth0#1 type macvlan
->panic


Fix: Dont set IFF_MACVLAN_PORT in error case.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Patrick McHardy <kaber@...sh.net>
CC: Jiri Pirko <jpirko@...hat.com>
---
This is a stable candidate (2.6.36+)

 drivers/net/macvlan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index d7c0bc62..1e12a27 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -584,8 +584,8 @@ static int macvlan_port_create(struct net_device *dev)
 	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 	if (err)
 		kfree(port);
-
-	dev->priv_flags |= IFF_MACVLAN_PORT;
+	else
+		dev->priv_flags |= IFF_MACVLAN_PORT;
 	return err;
 }
 


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