[PATCH 4.20 020/117] ip6_gre: update version related info when changing link

[Greg Kroah-Hartman]

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

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

From: Hangbin Liu <liuhang...@gmail.com>

[ Upstream commit 80b3671e9377916bf2b02e56113fa7377ce5705a ]

We forgot to update ip6erspan version related info when changing link,
which will cause setting new hwid failed.

Reported-by: Jianlin Shi <ji...@redhat.com>
Fixes: 94d7d8f292870 ("ip6_gre: add erspan v2 support")
Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv6/ip6_gre.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1169,6 +1169,10 @@ static void ip6gre_tnl_copy_tnl_parm(str
        t->parms.i_flags = p->i_flags;
        t->parms.o_flags = p->o_flags;
        t->parms.fwmark = p->fwmark;
+       t->parms.erspan_ver = p->erspan_ver;
+       t->parms.index = p->index;
+       t->parms.dir = p->dir;
+       t->parms.hwid = p->hwid;
        dst_cache_reset(&t->dst_cache);
 }