From 89146504cbfeb120dd08ec7f9f8314c4986189b8 Mon Sep 17 00:00:00 2001 From: Wang Chen Date: Mon, 14 Jul 2008 20:59:03 -0700 Subject: [PATCH] 8021q: Check return of dev_set_promiscuity/allmulti 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 Acked-by: Patrick McHardy Signed-off-by: David S. Miller --- net/8021q/vlan_dev.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c index 8efa399823e3..9efd3c67c1db 100644 --- a/net/8021q/vlan_dev.c +++ b/net/8021q/vlan_dev.c @@ -518,19 +518,35 @@ static int vlan_dev_open(struct net_device *dev) if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN); if (err < 0) - return err; + goto out; } - 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 del_unicast; + } + if (dev->flags & IFF_PROMISC) { + err = dev_set_promiscuity(real_dev, 1); + if (err < 0) + goto clear_allmulti; + } + + memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); if (vlan->flags & VLAN_FLAG_GVRP) vlan_gvrp_request_join(dev); return 0; + +clear_allmulti: + if (dev->flags & IFF_ALLMULTI) + dev_set_allmulti(real_dev, -1); +del_unicast: + if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) + dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN); +out: + return err; } static int vlan_dev_stop(struct net_device *dev)