From: David S. Miller <davem@sunset.davemloft.net>
Date: Fri, 31 Aug 2007 21:39:44 +0000 (-0700)
Subject: [TCP]: 'dst' can be NULL in tcp_rto_min()
X-Git-Tag: v2.6.23-rc6~22^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5c127c58ae9bf196d787815b1bd6b0aec5aee816;p=thirdparty%2Fkernel%2Flinux.git

[TCP]: 'dst' can be NULL in tcp_rto_min()

Reported by Rick Jones.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1ee72127462bf..bbad2cdb74b7c 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;
 }