linux-kernel - [PATCH 4.4 19/19] netfilter: nf_conntrack_h323: lost .data

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Date:   Tue,  7 Jul 2020 17:10:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Westphal <fw@...len.de>,
        Vasily Averin <vvs@...tuozzo.com>
Subject: [PATCH 4.4 19/19] netfilter: nf_conntrack_h323: lost .data_len definition for Q.931/ipv6

From: Vasily Averin <vvs@...tuozzo.com>

Could you please push this patch into stable@?
it fixes memory corruption in kernels  v3.5 .. v4.10

Lost .data_len definition leads to write beyond end of
struct nf_ct_h323_master. Usually it corrupts following
struct nf_conn_nat, however if nat is not loaded it corrupts
following slab object.

In mainline this problem went away in v4.11,
after commit 9f0f3ebeda47 ("netfilter: helpers: remove data_len usage
for inkernel helpers") however many stable kernels are still affected.

Fixes: 1afc56794e03 ("netfilter: nf_ct_helper: implement variable length helper private data") # v3.5
cc: stable@...r.kernel.org
Reviewed-by: Florian Westphal <fw@...len.de>
Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nf_conntrack_h323_main.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -1225,6 +1225,7 @@ static struct nf_conntrack_helper nf_con
 	{
 		.name			= "Q.931",
 		.me			= THIS_MODULE,
+		.data_len		= sizeof(struct nf_ct_h323_master),
 		.tuple.src.l3num	= AF_INET6,
 		.tuple.src.u.tcp.port	= cpu_to_be16(Q931_PORT),
 		.tuple.dst.protonum	= IPPROTO_TCP,