1 files changed, 3 insertions, 2 deletions

diff --git a/net/ipv4/netfilter/nf_nat_sip.c b/net/ipv4/netfilter/nf_nat_sip.c
index eef8f29e8bf8..4ad9cf173992 100644
--- a/net/ipv4/netfilter/nf_nat_sip.c
+++ b/net/ipv4/netfilter/nf_nat_sip.c
@@ -148,7 +148,7 @@ static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int dataoff,
         if (ct_sip_parse_header_uri(ct, *dptr, NULL, *datalen,
                                     hdr, NULL, &matchoff, &matchlen,
                                     &addr, &port) > 0) {
-                unsigned int matchend, poff, plen, buflen, n;
+                unsigned int olen, matchend, poff, plen, buflen, n;
                 char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
 
                 /* We're only interested in headers related to this
@@ -163,11 +163,12 @@ static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int dataoff,
                                 goto next;
                 }
 
+                olen = *datalen;
                 if (!map_addr(skb, dataoff, dptr, datalen, matchoff, matchlen,
                               &addr, port))
                         return NF_DROP;
 
-                matchend = matchoff + matchlen;
+                matchend = matchoff + matchlen + *datalen - olen;
 
                 /* The maddr= parameter (RFC 2361) specifies where to send
                  * the reply. */