From 28e3487b7dd8a9791baac924bc887140ec747bed Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Tue, 23 Sep 2008 02:51:41 -0700
Subject: [PATCH] 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>
---
net/ipv4/tcp_input.c | 2 ++
1 file changed, 2 insertions(+)
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))
--
2.30.9