[patch 019/101] Fix TCP FIN handling

[Greg KH]

From: John Heffner <jheffner@xxxxxxx>

We can accidently spit out a huge burst of packets with TSO
when the FIN back is piggybacked onto the final packet.

[TCP]: Don't apply FIN exception to full TSO segments.

Signed-off-by: John Heffner <jheffner@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/ipv4/tcp_output.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.20.1.orig/net/ipv4/tcp_output.c
+++ linux-2.6.20.1/net/ipv4/tcp_output.c
@@ -965,7 +965,8 @@ static inline unsigned int tcp_cwnd_test
 	u32 in_flight, cwnd;
 
 	/* Don't be strict about the congestion window for the final FIN.  */
-	if (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN)
+	if ((TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN) &&
+	    tcp_skb_pcount(skb) == 1)
 		return 1;
 
 	in_flight = tcp_packets_in_flight(tp);

--
-
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