[TCP]: Do the layer header setting in tcp_collapse relative to skb->data

That is equal to skb->head before skb_reserve, to help in the layer header
changes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index fb0256085948..e5d1c2c8cea7 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3632,11 +3632,13 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
                 nskb = alloc_skb(copy+header, GFP_ATOMIC);
                 if (!nskb)
                         return;
+
+                nskb->mac.raw = nskb->data + (skb->mac.raw - skb->head);
+                nskb->nh.raw = nskb->data + (skb->nh.raw - skb->head);
+                nskb->h.raw = nskb->data + (skb->h.raw - skb->head);
+
                 skb_reserve(nskb, header);
                 memcpy(nskb->head, skb->head, header);
-                nskb->nh.raw = nskb->head + (skb->nh.raw-skb->head);
-                nskb->h.raw = nskb->head + (skb->h.raw-skb->head);
-                nskb->mac.raw = nskb->head + (skb->mac.raw-skb->head);
                 memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
                 TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(nskb)->end_seq = start;
                 __skb_insert(nskb, skb->prev, skb, list);