linux-kernel - [PATCH 3.10 092/268] Input: kbtab - validate number of endpoints before using them

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Date:   Mon, 19 Jun 2017 20:29:51 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Johan Hovold <johan@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 092/268] Input: kbtab - validate number of endpoints before using them

From: Johan Hovold <johan@...nel.org>

commit cb1b494663e037253337623bf1ef2df727883cb7 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/input/tablet/kbtab.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c
index 3fba74b..f0d5326 100644
--- a/drivers/input/tablet/kbtab.c
+++ b/drivers/input/tablet/kbtab.c
@@ -123,6 +123,9 @@ static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *i
 	struct input_dev *input_dev;
 	int error = -ENOMEM;
 
+	if (intf->cur_altsetting->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!kbtab || !input_dev)
-- 
2.8.0.rc2.1.gbe9624a