[TCP]: MTUprobe: prepare skb fields earlier

They better be valid when call to write_queue functions is made
once things that follow are going in.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 98835afb8d8a..c2aa4688dae6 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1342,7 +1342,6 @@ static int tcp_mtu_probe(struct sock *sk)
         sk_charge_skb(sk, nskb);
 
         skb = tcp_send_head(sk);
-        tcp_insert_write_queue_before(nskb, skb, sk);
 
         TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(skb)->seq;
         TCP_SKB_CB(nskb)->end_seq = TCP_SKB_CB(skb)->seq + probe_size;
@@ -1351,6 +1350,8 @@ static int tcp_mtu_probe(struct sock *sk)
         nskb->csum = 0;
         nskb->ip_summed = skb->ip_summed;
 
+        tcp_insert_write_queue_before(nskb, skb, sk);
+
         len = 0;
         while (len < probe_size) {
                 next = tcp_write_queue_next(sk, skb);