linux-kernel - [PATCH 4.4 12/83] nfc: Ensure presence of required attributes in the activate

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Date:   Tue, 25 Jul 2017 12:18:36 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mateusz Jurczyk <mjurczyk@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH 4.4 12/83] nfc: Ensure presence of required attributes in the activate_target handler

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

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

From: Mateusz Jurczyk <mjurczyk@...gle.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@...gle.com>
Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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]);