linux-kernel - [PATCH 4.4 122/230] netfilter: nfnetlink_acct: validate NFACCT

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Date:   Fri, 22 Mar 2019 12:14:20 +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, Phil Turnbull <phil.turnbull@...cle.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Zubin Mithra <zsm@...omium.org>
Subject: [PATCH 4.4 122/230] netfilter: nfnetlink_acct: validate NFACCT_FILTER parameters

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

------------------

From: Phil Turnbull <phil.turnbull@...cle.com>

commit 017b1b6d28c479f1ad9a7a41f775545a3e1cba35 upstream.

nfacct_filter_alloc doesn't validate the NFACCT_FILTER_MASK and
NFACCT_FILTER_VALUE parameters which can trigger a NULL pointer
dereference. CAP_NET_ADMIN is required to trigger the bug.

Signed-off-by: Phil Turnbull <phil.turnbull@...cle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Cc: Zubin Mithra <zsm@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nfnetlink_acct.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -243,6 +243,9 @@ nfacct_filter_alloc(const struct nlattr
 	if (err < 0)
 		return ERR_PTR(err);
 
+	if (!tb[NFACCT_FILTER_MASK] || !tb[NFACCT_FILTER_VALUE])
+		return ERR_PTR(-EINVAL);
+
 	filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL);
 	if (!filter)
 		return ERR_PTR(-ENOMEM);