netdev - Re: [PATCH] make _minimum_ TCP retransmission timeout configurable take 2

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Message-Id: <20070831.143855.88699905.davem@davemloft.net>
Date:	Fri, 31 Aug 2007 14:38:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] make _minimum_ TCP retransmission timeout configurable
 take 2

From: Rick Jones <rick.jones2@...com>
Date: Fri, 31 Aug 2007 13:59:50 -0700

> ip is at tcp_rto_min+0x20/0x40

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1ee7212..bbad2cd 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -560,7 +560,7 @@ static u32 tcp_rto_min(struct sock *sk)
 	struct dst_entry *dst = __sk_dst_get(sk);
 	u32 rto_min = TCP_RTO_MIN;
 
-	if (dst_metric_locked(dst, RTAX_RTO_MIN))
+	if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
 		rto_min = dst->metrics[RTAX_RTO_MIN-1];
 	return rto_min;
 }
-
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