From ae82590cf6402be3c3976edc7a1cba852207a8c9 Mon Sep 17 00:00:00 2001
From: ps <ps@FreeBSD.org>
Date: Sun, 10 Apr 2005 05:20:10 +0000
Subject: [PATCH] When the rightmost SACK block expands, rcv_lastsack should be
 updated. (Fix for kern/78226).

Submitted by : Noritoshi Demizu <demizu at dd dot iij4u dot or dot jp>
Reviewed by  : Mohan Srinivasan (mohans at yahoo-inc dot com),
               Raja Mukerji (raja at moselle dot com).
---
 sys/netinet/tcp_sack.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/netinet/tcp_sack.c b/sys/netinet/tcp_sack.c
index c288da84b2e..efe3bb6c469 100644
--- a/sys/netinet/tcp_sack.c
+++ b/sys/netinet/tcp_sack.c
@@ -463,6 +463,8 @@ tcp_sack_option(struct tcpcb *tp, struct tcphdr *th, u_char *cp, int optlen)
 			tp->snd_numholes++;
 			tcp_sack_globalholes++;
 		}
+		if (SEQ_LT(tp->rcv_lastsack, sack.end))
+			tp->rcv_lastsack = sack.end;
 	}
 	return (0);
 }
-- 
2.45.2