From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org,
pabeni@redhat.com, edumazet@google.com, fw@strlen.de
Subject: [PATCH net 3/5] netfilter: conntrack: fix NULL pointer dereference in nf_confirm_cthelper
Date: Wed, 7 Jun 2023 00:58:49 +0200 [thread overview]
Message-ID: <20230606225851.67394-4-pablo@netfilter.org> (raw)
In-Reply-To: <20230606225851.67394-1-pablo@netfilter.org>
From: Tijs Van Buggenhout <tijs.van.buggenhout@axsguard.com>
An nf_conntrack_helper from nf_conn_help may become NULL after DNAT.
Observed when TCP port 1720 (Q931_PORT), associated with h323 conntrack
helper, is DNAT'ed to another destination port (e.g. 1730), while
nfqueue is being used for final acceptance (e.g. snort).
This happenned after transition from kernel 4.14 to 5.10.161.
Workarounds:
* keep the same port (1720) in DNAT
* disable nfqueue
* disable/unload h323 NAT helper
$ linux-5.10/scripts/decode_stacktrace.sh vmlinux < /tmp/kernel.log
BUG: kernel NULL pointer dereference, address: 0000000000000084
[..]
RIP: 0010:nf_conntrack_update (net/netfilter/nf_conntrack_core.c:2080 net/netfilter/nf_conntrack_core.c:2134) nf_conntrack
[..]
nfqnl_reinject (net/netfilter/nfnetlink_queue.c:237) nfnetlink_queue
nfqnl_recv_verdict (net/netfilter/nfnetlink_queue.c:1230) nfnetlink_queue
nfnetlink_rcv_msg (net/netfilter/nfnetlink.c:241) nfnetlink
[..]
Fixes: ee04805ff54a ("netfilter: conntrack: make conntrack userspace helpers work again")
Signed-off-by: Tijs Van Buggenhout <tijs.van.buggenhout@axsguard.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nf_conntrack_core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index c4ccfec6cb98..d119f1d4c2fc 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -2260,6 +2260,9 @@ static int nf_confirm_cthelper(struct sk_buff *skb, struct nf_conn *ct,
return 0;
helper = rcu_dereference(help->helper);
+ if (!helper)
+ return 0;
+
if (!(helper->flags & NF_CT_HELPER_F_USERSPACE))
return 0;
--
2.30.2
next prev parent reply other threads:[~2023-06-06 22:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-06 22:58 [PATCH net 0/5] Netfilter fixes for net Pablo Neira Ayuso
2023-06-06 22:58 ` [PATCH net 1/5] netfilter: nf_tables: Add null check for nla_nest_start_noflag() in nft_dump_basechain_hook() Pablo Neira Ayuso
2023-06-07 5:00 ` patchwork-bot+netdevbpf
2023-06-06 22:58 ` [PATCH net 2/5] netfilter: nft_bitwise: fix register tracking Pablo Neira Ayuso
2023-06-06 22:58 ` Pablo Neira Ayuso [this message]
2023-06-06 22:58 ` [PATCH net 4/5] netfilter: ipset: Add schedule point in call_ad() Pablo Neira Ayuso
2023-06-06 22:58 ` [PATCH net 5/5] netfilter: nf_tables: out-of-bound check in chain blob Pablo Neira Ayuso
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