From: David S. Miller <davem@davemloft.net>
Date: Wed, 24 Nov 2010 19:47:22 +0000 (-0800)
Subject: tcp: Make TCP_MAXSEG minimum more correct.
X-Git-Tag: firefly_0821_release~10186^2~424
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d9d89091ffe11687f7fa20b7d75b08d9e1dc1421;p=firefly-linux-kernel-4.4.55.git

tcp: Make TCP_MAXSEG minimum more correct.

commit c39508d6f118308355468314ff414644115a07f3 upstream.

Use TCP_MIN_MSS instead of constant 64.

Reported-by: Min Zhang <mzhang@mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Moritz Muehlenhoff <jmm@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 9d4d60080d05..f0956595006b 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2117,7 +2117,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		/* Values greater than interface MTU won't take effect. However
 		 * at the point when this call is done we typically don't yet
 		 * know which interface is going to be used */
-		if (val < 64 || val > MAX_TCP_WINDOW) {
+		if (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW) {
 			err = -EINVAL;
 			break;
 		}