netdev - v4 [PATCH 8/9] macvlan: Check return of dev_set

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Message-ID: <487C12A1.6010904@cn.fujitsu.com>
Date:	Tue, 15 Jul 2008 10:59:45 +0800
From:	Wang Chen <wangchen@...fujitsu.com>
To:	"David S. Miller" <davem@...emloft.net>
CC:	Patrick McHardy <kaber@...sh.net>, NETDEV <netdev@...r.kernel.org>
Subject: v4 [PATCH 8/9] macvlan: Check return of dev_set_allmulti

allmulti might overflow.
Commit: "netdevice: Fix promiscuity and allmulti overflow" in net-next makes
dev_set_promiscuity/allmulti return error number if overflow happened.

Here, we check the positive increment for allmulti to get error return.

Signed-off-by: Wang Chen <wangchen@...fujitsu.com>
Acked-by: Patrick McHardy <kaber@...sh.net>
---
 drivers/net/macvlan.c |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index c36a03a..a857330 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -189,12 +189,20 @@ static int macvlan_open(struct net_device *dev)

 	err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
 	if (err < 0)
-		return err;
-	if (dev->flags & IFF_ALLMULTI)
-		dev_set_allmulti(lowerdev, 1);
+		goto out;
+	if (dev->flags & IFF_ALLMULTI) {
+		err = dev_set_allmulti(lowerdev, 1);
+		if (err < 0)
+			goto del_unicast;
+	}

 	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
 	return 0;
+
+del_unicast:
+	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
+out:
+	return err;
 }

 static int macvlan_stop(struct net_device *dev)

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