From: David S. Miller <davem@davemloft.net>
Date: Tue, 23 Sep 2008 09:51:41 +0000 (-0700)
Subject: tcp: Fix queue traversal in tcp_use_frto().
X-Git-Tag: v2.6.28-rc1~717^2~199
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=28e3487b7dd8a9791baac924bc887140ec747bed;p=karo-tx-linux.git

tcp: Fix queue traversal in tcp_use_frto().

We must check tcp_skb_is_last() before doing a tcp_write_queue_next().

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index cbfe13d5f423..3b76bce769dd 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1746,6 +1746,8 @@ int tcp_use_frto(struct sock *sk)
 		return 0;
 
 	skb = tcp_write_queue_head(sk);
+	if (tcp_skb_is_last(sk, skb))
+		return 1;
 	skb = tcp_write_queue_next(sk, skb);	/* Skips head */
 	tcp_for_write_queue_from(skb, sk) {
 		if (skb == tcp_send_head(sk))