linux-kernel - [PATCH 5.4 77/78] netfilter: conntrack: dccp, sctp: handle null timeout argument

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Date:   Tue, 14 Jan 2020 11:01:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+46a4ad33f345d1dd346e@...kaller.appspotmail.com,
        Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 5.4 77/78] netfilter: conntrack: dccp, sctp: handle null timeout argument

From: Florian Westphal <fw@...len.de>

commit 1d9a7acd3d1e74c2d150d8934f7f55bed6d70858 upstream.

The timeout pointer can be NULL which means we should modify the
per-nets timeout instead.

All do this, except sctp and dccp which instead give:

general protection fault: 0000 [#1] PREEMPT SMP KASAN
net/netfilter/nf_conntrack_proto_dccp.c:682
 ctnl_timeout_parse_policy+0x150/0x1d0 net/netfilter/nfnetlink_cttimeout.c:67
 cttimeout_default_set+0x150/0x1c0 net/netfilter/nfnetlink_cttimeout.c:368
 nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477

Reported-by: syzbot+46a4ad33f345d1dd346e@...kaller.appspotmail.com
Fixes: c779e849608a8 ("netfilter: conntrack: remove get_timeout() indirection")
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nf_conntrack_proto_dccp.c |    3 +++
 net/netfilter/nf_conntrack_proto_sctp.c |    3 +++
 2 files changed, 6 insertions(+)

--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -677,6 +677,9 @@ static int dccp_timeout_nlattr_to_obj(st
 	unsigned int *timeouts = data;
 	int i;
 
+	if (!timeouts)
+		 timeouts = dn->dccp_timeout;
+
 	/* set default DCCP timeouts. */
 	for (i=0; i<CT_DCCP_MAX; i++)
 		timeouts[i] = dn->dccp_timeout[i];
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -594,6 +594,9 @@ static int sctp_timeout_nlattr_to_obj(st
 	struct nf_sctp_net *sn = nf_sctp_pernet(net);
 	int i;
 
+	if (!timeouts)
+		timeouts = sn->timeouts;
+
 	/* set default SCTP timeouts. */
 	for (i=0; i<SCTP_CONNTRACK_MAX; i++)
 		timeouts[i] = sn->timeouts[i];