diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index 0256305..6213787 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -114,7 +114,8 @@
 {
 	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
 	int dir = CTINFO2DIR(ctinfo);
-	struct tcphdr _tcph, *th;
+	const struct tcphdr *th;
+	struct tcphdr _tcph;
 	int tcpdatalen;
 	int tcpdataoff;
 	unsigned char *tpkt;
@@ -212,11 +213,11 @@
 }
 
 /****************************************************************************/
-static int get_h245_addr(struct nf_conn *ct, unsigned char *data,
+static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
 			 H245_TransportAddress *taddr,
 			 union nf_inet_addr *addr, __be16 *port)
 {
-	unsigned char *p;
+	const unsigned char *p;
 	int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 	int len;
 
@@ -625,7 +626,7 @@
 		  TransportAddress *taddr,
 		  union nf_inet_addr *addr, __be16 *port)
 {
-	unsigned char *p;
+	const unsigned char *p;
 	int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 	int len;
 
@@ -704,9 +705,8 @@
 
 /* If the calling party is on the same side of the forward-to party,
  * we don't need to track the second call */
-static int callforward_do_filter(union nf_inet_addr *src,
-				 union nf_inet_addr *dst,
-				 int family)
+static int callforward_do_filter(const union nf_inet_addr *src,
+                                 const union nf_inet_addr *dst, int family)
 {
 	const struct nf_afinfo *afinfo;
 	struct flowi fl1, fl2;
@@ -1185,7 +1185,8 @@
 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
 				   int *datalen)
 {
-	struct udphdr _uh, *uh;
+	const struct udphdr *uh;
+	struct udphdr _uh;
 	int dataoff;
 
 	uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
@@ -1468,7 +1469,7 @@
 		       enum ip_conntrack_info ctinfo,
 		       unsigned char **data, AdmissionRequest *arq)
 {
-	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
 	int dir = CTINFO2DIR(ctinfo);
 	__be16 port;
 	union nf_inet_addr addr;