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ipv6: 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@cn.fujitsu.com>
Acked-by: Patrick McHardy <kaber@trash.net> 
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wang Chen 2008-07-14 20:54:23 -07:00 committed by David S. Miller
parent bc3f9076f6
commit 5ae7b44413
1 changed files with 9 additions and 2 deletions
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11
net/ipv6/ip6mr.c
View File

@ -595,6 +595,7 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
int vifi = vifc->mif6c_mifi;
struct mif_device *v = &vif6_table[vifi];
struct net_device *dev;
int err;
/* Is vif busy ? */
if (MIF_EXISTS(vifi))
@ -612,6 +613,11 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
dev = ip6mr_reg_vif();
if (!dev)
return -ENOBUFS;
err = dev_set_allmulti(dev, 1);
if (err) {
unregister_netdevice(dev);
return err;
}
break;
#endif
case 0:
@ -619,13 +625,14 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
if (!dev)
return -EADDRNOTAVAIL;
dev_put(dev);
err = dev_set_allmulti(dev, 1);
if (err)
return err;
break;
default:
return -EINVAL;
}
dev_set_allmulti(dev, 1);
/*
* Fill in the VIF structures
*/