[PATCH 4.4 12/83] nfc: Ensure presence of required attributes in the activate_target handler

Path	csiph.com!news.mixmin.net!news.unit0.net!news.panservice.it!bofh.it!news.nic.it!robomod
From	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups	linux.kernel
Subject	[PATCH 4.4 12/83] nfc: Ensure presence of required attributes in the activate_target handler
Date	Tue, 25 Jul 2017 21:30:03 +0200
Message-ID	<u7dGP-6Sz-55@gated-at.bofh.it> (permalink)
References	<u7dGO-6Sz-33@gated-at.bofh.it>
X-Mailer	git-send-email 2.13.3
User-Agent	quilt/0.65
MIME-Version	1.0
Content-Type	text/plain; charset=UTF-8
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	36
Organization	linux.* mail to news gateway
X-Original-Cc	Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org, Mateusz Jurczyk <mjurczyk@google.com>, Kees Cook <keescook@chromium.org>, Samuel Ortiz <sameo@linux.intel.com>
X-Original-Date	Tue, 25 Jul 2017 12:18:36 -0700
X-Original-Message-ID	<20170725191710.250316726@linuxfoundation.org>
X-Original-References	<20170725191708.449126292@linuxfoundation.org>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	csiph.com linux.kernel:1696082

Show key headers only | View raw

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

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

From: Mateusz Jurczyk <mjurczyk@google.com>

commit a0323b979f81ad2deb2c8836eab506534891876a upstream.

Check that the NFC_ATTR_TARGET_INDEX and NFC_ATTR_PROTOCOLS attributes (in
addition to NFC_ATTR_DEVICE_INDEX) are provided by the netlink client
prior to accessing them. This prevents potential unhandled NULL pointer
dereference exceptions which can be triggered by malicious user-mode
programs, if they omit one or both of these attributes.

Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/nfc/netlink.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -873,7 +873,9 @@ static int nfc_genl_activate_target(stru
 	u32 device_idx, target_idx, protocol;
 	int rc;
 
-	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
+	    !info->attrs[NFC_ATTR_TARGET_INDEX] ||
+	    !info->attrs[NFC_ATTR_PROTOCOLS])
 		return -EINVAL;
 
 	device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH 4.4 12/83] nfc: Ensure presence of required attributes in the activate_target handler Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-07-25 21:30 +0200

csiph-web