linux-kernel - [PATCH 3.11 122/138] macvlan: Don't propagate IFF

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Message-Id: <1401795584-22664-123-git-send-email-luis.henriques@canonical.com>
Date:	Tue,  3 Jun 2014 12:39:28 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Peter Christensen <pch@...bogen.com>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 122/138] macvlan: Don't propagate IFF_ALLMULTI changes on down interfaces.

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

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

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

commit bbeb0eadcf9fe74fb2b9b1a6fea82cd538b1e556 upstream.

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: Luis Henriques <luis.henriques@...onical.com>
---
 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 9f7dd0ce4c70..e64fb8bc3e97 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -423,8 +423,10 @@ 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_mac_lists(struct net_device *dev)
-- 
1.9.1

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