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ipv6: recursive check rt->dst.from when call rt6_check_expired

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If dst cache dst_a copies from dst_b, and dst_b copies from dst_c, check
if dst_a is expired or not, we should not end with dst_a->dst.from, dst_b,
we should check dst_c.

CC: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing 2012-09-13 19:54:57 +00:00 committed by David S. Miller
parent b40863c667
commit 3fd91fb358
1 changed files with 1 additions and 5 deletions
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6
net/ipv6/route.c
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@ -369,15 +369,11 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
static bool rt6_check_expired(const struct rt6_info *rt)
{
struct rt6_info *ort = NULL;
if (rt->rt6i_flags & RTF_EXPIRES) {
if (time_after(jiffies, rt->dst.expires))
return true;
} else if (rt->dst.from) {
ort = (struct rt6_info *) rt->dst.from;
return (ort->rt6i_flags & RTF_EXPIRES) &&
time_after(jiffies, ort->dst.expires);
return rt6_check_expired((struct rt6_info *) rt->dst.from);
}
return false;
}