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-rw-r--r--net/ipv4/netfilter/nf_nat_proto_gre.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c
index b887ebb42133..a1e4da16da2e 100644
--- a/net/ipv4/netfilter/nf_nat_proto_gre.c
+++ b/net/ipv4/netfilter/nf_nat_proto_gre.c
@@ -104,7 +104,7 @@ gre_manip_pkt(struct sk_buff *skb, unsigned int iphdroff,
{
struct gre_hdr *greh;
struct gre_hdr_pptp *pgreh;
- struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
+ const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
unsigned int hdroff = iphdroff + iph->ihl * 4;
/* pgreh includes two optional 32bit fields which are not required
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