Re: [PATCH 1/2] ip_gre: fix potential memory leak in erspan_rcv

If md is NULL, tun_dst must be freed, otherwise it will cause memory
leak.

Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Cc: William Tu <redacted>
Signed-off-by: Haishuang Yan <redacted>
---
 net/ipv4/ip_gre.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index d828821..9253d6f 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c

@@ -304,8 +304,10 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
                                return PACKET_REJECT;

                        md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
-                       if (!md)
+                       if (!md) {
+                               dst_release((struct dst_entry *)tun_dst);
                                return PACKET_REJECT;
+                       }