From 23ec47a0889dabf4b9e7f8d52e848194734159ee Mon Sep 17 00:00:00 2001
From: Vladislav Yasevich <vladislav.yasevich@hp.com>
Date: Fri, 11 Nov 2005 16:05:55 -0800
Subject: [SCTP]: Fix potential NULL pointer dereference in sctp_v4_get_saddr

It is possible to get to sctp_v4_get_saddr() without a valid
association.  This happens when processing OOTB packets and
the cached route entry is no longer valid.
However, when responding to OOTB packets we already properly
set the source address based on the information in the OOTB
packet.  So, if we we get to sctp_v4_get_saddr() without an
association we can simply return.

Signed-off-by: Vladislav Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 26de4d3..dc9dff3 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -530,6 +530,9 @@ static void sctp_v4_get_saddr(struct sctp_association *asoc,
 {
 	struct rtable *rt = (struct rtable *)dst;
 
+	if (!asoc)
+		return;
+
 	if (rt) {
 		saddr->v4.sin_family = AF_INET;
 		saddr->v4.sin_port = asoc->base.bind_addr.port;  
-- 
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