[patch 19/59] NETFILTER: ctnetlink: check for status attribute existence on conntrack creation

[Chris Wright <chrisw@sous-sol.org>]

-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Pablo Neira Ayuso <pablo@netfilter.org>

Check that status flags are available in the netlink message received
to create a new conntrack.

Fixes a crash in ctnetlink_create_conntrack when the CTA_STATUS attribute
is not present.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---

 net/ipv4/netfilter/ip_conntrack_netlink.c |    8 +++++---
 net/netfilter/nf_conntrack_netlink.c      |    8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

--- linux-2.6.19.2.orig/net/ipv4/netfilter/ip_conntrack_netlink.c
+++ linux-2.6.19.2/net/ipv4/netfilter/ip_conntrack_netlink.c
@@ -946,9 +946,11 @@ ctnetlink_create_conntrack(struct nfattr
 	ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
 	ct->status |= IPS_CONFIRMED;
 
-	err = ctnetlink_change_status(ct, cda);
-	if (err < 0)
-		goto err;
+	if (cda[CTA_STATUS-1]) {
+		err = ctnetlink_change_status(ct, cda);
+		if (err < 0)
+			goto err;
+	}
 
 	if (cda[CTA_PROTOINFO-1]) {
 		err = ctnetlink_change_protoinfo(ct, cda);
--- linux-2.6.19.2.orig/net/netfilter/nf_conntrack_netlink.c
+++ linux-2.6.19.2/net/netfilter/nf_conntrack_netlink.c
@@ -963,9 +963,11 @@ ctnetlink_create_conntrack(struct nfattr
 	ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
 	ct->status |= IPS_CONFIRMED;
 
-	err = ctnetlink_change_status(ct, cda);
-	if (err < 0)
-		goto err;
+	if (cda[CTA_STATUS-1]) {
+		err = ctnetlink_change_status(ct, cda);
+		if (err < 0)
+			goto err;
+	}
 
 	if (cda[CTA_PROTOINFO-1]) {
 		err = ctnetlink_change_protoinfo(ct, cda);

--
-
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