[PATCH net-next 8/8] 8021q: Check return of dev_set_promiscuity/allmulti

[Wang Chen <wangchen@cn.fujitsu.com>]

dev_set_promiscuity/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 all positive increment for promiscuity and allmulti
to get error return.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
---
 net/8021q/vlan_dev.c |   19 +++++++++++++++----
 1 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 5d055c2..1f2669b 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -547,12 +547,23 @@ static int vlan_dev_open(struct net_device *dev)
 	}
 	memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 
-	if (dev->flags & IFF_ALLMULTI)
-		dev_set_allmulti(real_dev, 1);
-	if (dev->flags & IFF_PROMISC)
-		dev_set_promiscuity(real_dev, 1);
+	if (dev->flags & IFF_ALLMULTI) {
+		err = dev_set_allmulti(real_dev, 1);
+		if (err < 0)
+			goto out;
+	}
+	if (dev->flags & IFF_PROMISC) {
+		err = dev_set_promiscuity(real_dev, 1);
+		if (err < 0)
+			goto out;
+	}
 
 	return 0;
+
+out:
+	if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
+		dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
+	return err;
 }
 
 static int vlan_dev_stop(struct net_device *dev)
-- 
1.5.3.4