netdev - [patch -next] tcp: update a call to tcp_metric

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Message-ID: <20120712144637.GA24202@elgon.mountain>
Date:	Thu, 12 Jul 2012 17:46:38 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch -next] tcp: update a call to tcp_metric_set()

We changed how the metrics were stored so RTAX_CWND needs to be changed
to TCP_METRIC_CWND or it leads to write past the end of the
->tcpm_vals[] array.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 1fd83d3..c6b0f20 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -412,7 +412,8 @@ void tcp_update_metrics(struct sock *sk)
 				       max(tp->snd_cwnd >> 1, tp->snd_ssthresh));
 		if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
 			val = tcp_metric_get(tm, TCP_METRIC_CWND);
-			tcp_metric_set(tm, RTAX_CWND, (val + tp->snd_cwnd) >> 1);
+			tcp_metric_set(tm, TCP_METRIC_CWND,
+				       (val + tp->snd_cwnd) >> 1);
 		}
 	} else {
 		/* Else slow start did not finish, cwnd is non-sense,
--
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