[NETFILTER]: nf_{conntrack,nat}_proto_gre: annotate with const

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
index 4a185f6aa65a..e10024a1b666 100644
--- a/net/netfilter/nf_conntrack_proto_gre.c
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -161,9 +161,11 @@ static int gre_pkt_to_tuple(const struct sk_buff *skb,
                            unsigned int dataoff,
                            struct nf_conntrack_tuple *tuple)
 {
-        struct gre_hdr_pptp _pgrehdr, *pgrehdr;
+        const struct gre_hdr_pptp *pgrehdr;
+        struct gre_hdr_pptp _pgrehdr;
         __be16 srckey;
-        struct gre_hdr _grehdr, *grehdr;
+        const struct gre_hdr *grehdr;
+        struct gre_hdr _grehdr;
 
         /* first only delinearize old RFC1701 GRE header */
         grehdr = skb_header_pointer(skb, dataoff, sizeof(_grehdr), &_grehdr);