linux-kernel - [PATCH 3.2 22/92] macvlan: Don't propagate IFF

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Message-ID: <lsq.1402104388.553134916@decadent.org.uk>
Date:	Sat, 07 Jun 2014 02:26:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Peter Christensen" <pch@...bogen.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.2 22/92] macvlan: Don't propagate IFF_ALLMULTI changes
 on down  interfaces.

3.2.60-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Peter Christensen <pch@...bogen.com>

[ Upstream commit bbeb0eadcf9fe74fb2b9b1a6fea82cd538b1e556 ]

Clearing the IFF_ALLMULTI flag on a down interface could cause an allmulti
overflow on the underlying interface.

Attempting the set IFF_ALLMULTI on the underlying interface would cause an
error and the log message:

"allmulti touches root, set allmulti failed."

Signed-off-by: Peter Christensen <pch@...bogen.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/macvlan.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index ab5786b..b74cdf6 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -391,8 +391,10 @@ static void macvlan_change_rx_flags(struct net_device *dev, int change)
 	struct macvlan_dev *vlan = netdev_priv(dev);
 	struct net_device *lowerdev = vlan->lowerdev;
 
-	if (change & IFF_ALLMULTI)
-		dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+	if (dev->flags & IFF_UP) {
+		if (change & IFF_ALLMULTI)
+			dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+	}
 }
 
 static void macvlan_set_multicast_list(struct net_device *dev)

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