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ipv6: release reference of ip6_null_entry's dst entry in __ip6_del_rt

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as we hold dst_entry before we call __ip6_del_rt,
so we should alse call dst_release not only return
-ENOENT when the rt6_info is ip6_null_entry.

and we already hold the dst entry, so I think it's
safe to call dst_release out of the write-read lock.

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 2012-09-19 19:25:34 +00:00 committed by David S. Miller
parent 32418cfe49
commit 6825a26c2d
1 changed files with 6 additions and 5 deletions
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11
net/ipv6/route.c
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@ -1593,17 +1593,18 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
struct fib6_table *table;
struct net *net = dev_net(rt->dst.dev);
if (rt == net->ipv6.ip6_null_entry)
return -ENOENT;
if (rt == net->ipv6.ip6_null_entry) {
err = -ENOENT;
goto out;
}
table = rt->rt6i_table;
write_lock_bh(&table->tb6_lock);
err = fib6_del(rt, info);
dst_release(&rt->dst);
write_unlock_bh(&table->tb6_lock);
out:
dst_release(&rt->dst);
return err;
}