1 files changed, 6 insertions, 13 deletions

diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index 8f3f32faaf4c..28fc8edfdc3a 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -119,20 +119,15 @@ out:
 static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
 {
         int err;
-        struct ipv6hdr *top_iph;
         struct ip_comp_hdr *ipch;
         struct ipcomp_data *ipcd = x->data;
         int plen, dlen;
         u8 *start, *scratch;
         struct crypto_comp *tfm;
         int cpu;
-        int hdr_len;
-
-        skb_push(skb, -skb_network_offset(skb));
-        hdr_len = skb_transport_offset(skb);
 
         /* check whether datagram len is larger than threshold */
-        if ((skb->len - hdr_len) < ipcd->threshold) {
+        if (skb->len < ipcd->threshold) {
                 goto out_ok;
         }
 
@@ -140,9 +135,9 @@ static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
                 goto out_ok;
 
         /* compression */
-        plen = skb->len - hdr_len;
+        plen = skb->len;
         dlen = IPCOMP_SCRATCH_SIZE;
-        start = skb_transport_header(skb);
+        start = skb->data;
 
         cpu = get_cpu();
         scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
@@ -155,13 +150,9 @@ static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
         }
         memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
         put_cpu();
-        pskb_trim(skb, hdr_len + dlen + sizeof(struct ip_comp_hdr));
+        pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
 
         /* insert ipcomp header and replace datagram */
-        top_iph = ipv6_hdr(skb);
-
-        top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
-
         ipch = ip_comp_hdr(skb);
         ipch->nexthdr = *skb_mac_header(skb);
         ipch->flags = 0;
@@ -169,6 +160,8 @@ static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
         *skb_mac_header(skb) = IPPROTO_COMP;
 
 out_ok:
+        skb_push(skb, -skb_network_offset(skb));
+
         return 0;
 }