linux-kernel - [144/156] tcp: Fix tcp_mark_head

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Date:	Tue, 30 Mar 2010 15:42:58 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Lennart Schulte <lennart.schulte@...s.rwth-aachen.de>,
	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [144/156] tcp: Fix tcp_mark_head_lost() with packets == 0

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Lennart Schulte <lennart.schulte@...s.rwth-aachen.de>

[ Upstream commit 6830c25b7d08fbbd922959425193791bc42079f2 ]

A packet is marked as lost in case packets == 0, although nothing should be done.
This results in a too early retransmitted packet during recovery in some cases.
This small patch fixes this issue by returning immediately.

Signed-off-by: Lennart Schulte <lennart.schulte@...s.rwth-aachen.de>
Signed-off-by: Arnd Hannemann <hannemann@...s.rwth-aachen.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/ipv4/tcp_input.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2499,6 +2499,9 @@ static void tcp_mark_head_lost(struct so
 	int err;
 	unsigned int mss;
 
+	if (packets == 0)
+		return;
+
 	WARN_ON(packets > tp->packets_out);
 	if (tp->lost_skb_hint) {
 		skb = tp->lost_skb_hint;


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