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-rw-r--r--net/ipv4/netfilter/ip_nat_helper_pptp.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/netfilter/ip_nat_helper_pptp.c b/net/ipv4/netfilter/ip_nat_helper_pptp.c
index ac004895781a..b9c016c063b8 100644
--- a/net/ipv4/netfilter/ip_nat_helper_pptp.c
+++ b/net/ipv4/netfilter/ip_nat_helper_pptp.c
@@ -52,6 +52,8 @@
#define IP_NAT_PPTP_VERSION "3.0"
+#define REQ_CID(req, off) (*(u_int16_t *)((char *)(req) + (off)))
+
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
MODULE_DESCRIPTION("Netfilter NAT helper module for PPTP");
@@ -198,7 +200,7 @@ pptp_outbound_pkt(struct sk_buff **pskb,
/* only OUT_CALL_REQUEST, IN_CALL_REPLY, CALL_CLEAR_REQUEST pass
* down to here */
DEBUGP("altering call id from 0x%04x to 0x%04x\n",
- ntohs(*(u_int16_t *)pptpReq + cid_off), ntohs(new_callid));
+ ntohs(REQ_CID(pptpReq, cid_off)), ntohs(new_callid));
/* mangle packet */
if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
@@ -342,7 +344,7 @@ pptp_inbound_pkt(struct sk_buff **pskb,
/* mangle packet */
DEBUGP("altering peer call id from 0x%04x to 0x%04x\n",
- ntohs(*(u_int16_t *)pptpReq + pcid_off), ntohs(new_pcid));
+ ntohs(REQ_CID(pptpReq, pcid_off)), ntohs(new_pcid));
if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
pcid_off + sizeof(struct pptp_pkt_hdr) +
@@ -353,7 +355,7 @@ pptp_inbound_pkt(struct sk_buff **pskb,
if (new_cid) {
DEBUGP("altering call id from 0x%04x to 0x%04x\n",
- ntohs(*(u_int16_t *)pptpReq + cid_off), ntohs(new_cid));
+ ntohs(REQ_CID(pptpReq, cid_off)), ntohs(new_cid));
if (ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
cid_off + sizeof(struct pptp_pkt_hdr) +
sizeof(struct PptpControlHeader),