[ 091/108] ipv6: release reference of ip6_null_entrys dst entry in __ip6_del_rt

[Ben Hutchings]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gao feng <gaofeng@xxxxxxxxxxxxxx>

[ Upstream commit 6825a26c2dc21eb4f8df9c06d3786ddec97cf53b ]

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@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/ipv6/route.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 2e21751..488a1b7 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1435,17 +1435,18 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 	struct fib6_table *table;
 	struct net *net = dev_net(rt->rt6i_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;
 }
 


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