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Date:	Wed,  3 Oct 2007 14:00:16 +0300
From:	"Ilpo Järvinen" <>
To:	David Miller <>,
	Cedric Le Goater <>
Subject: [PATCH 1/3] [TCP]: Fix two off-by-one errors in fackets_out adjusting logic

1) Passing wrong skb to tcp_adjust_fackets_out could corrupt
fastpath_cnt_hint as tcp_skb_pcount(next_skb) is not included
to it if hint points exactly to the next_skb (it's lagging
behind, see sacktag).

2) When fastpath_skb_hint is put backwards to avoid dangling
skb reference, the skb's pcount must also be removed from count
(not included like above).

Reported by Cedric Le Goater <>

Signed-off-by: Ilpo Järvinen <>
 net/ipv4/tcp_output.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 6199abe..5329675 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1755,14 +1755,16 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m
 		if (tcp_is_reno(tp) && tp->sacked_out)
 			tcp_dec_pcount_approx(&tp->sacked_out, next_skb);
-		tcp_adjust_fackets_out(tp, skb, tcp_skb_pcount(next_skb));
+		tcp_adjust_fackets_out(tp, next_skb, tcp_skb_pcount(next_skb));
 		tp->packets_out -= tcp_skb_pcount(next_skb);
 		/* changed transmit queue under us so clear hints */
 		/* manually tune sacktag skb hint */
-		if (tp->fastpath_skb_hint == next_skb)
+		if (tp->fastpath_skb_hint == next_skb) {
 			tp->fastpath_skb_hint = skb;
+			tp->fastpath_cnt_hint -= tcp_skb_pcount(skb);
+		}
 		sk_stream_free_skb(sk, next_skb);

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