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neigh: disallow un-init_net to change thresh of neigh

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thresh and interval are global resources,
only init net can change them.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao feng 2013-06-20 10:01:34 +08:00 committed by David S. Miller
parent 170d6f9954
commit dc25c676f5
1 changed files with 6 additions and 0 deletions
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6
net/core/neighbour.c
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@ -2049,6 +2049,12 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
}
}
err = -ENOENT;
if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] ||
tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) &&
!net_eq(net, &init_net))
goto errout_tbl_lock;
if (tb[NDTA_THRESH1])
tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]);