When __ip6_tnl_rcv fails, the tun_dst won't be freed, so call
dst_release to free it in error code path.

CC: Alexei Starovoitov <a...@fb.com>
Fixes: 8d79266bc48c ("ip6_tunnel: add collect_md mode to IPv6 tunnels")
Signed-off-by: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>

---
Changes in v2:
  - Add the the missing Fixes information
Changes in v3:
  - Free tun_dst from error code path
---
 net/ipv6/ip6_tunnel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 9b37f97..ef99d59 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -859,6 +859,8 @@ static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct 
sk_buff *skb,
        return 0;
 
 drop:
+       if (tun_dst)
+               dst_release((struct dst_entry *)tun_dst);
        kfree_skb(skb);
        return 0;
 }
-- 
1.8.3.1



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