linux-kernel - [PATCH 4.4 20/76] Input: sur40 - validate number of endpoints before using them

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Date:   Tue, 28 Mar 2017 14:30:17 +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, Johan Hovold <johan@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.4 20/76] Input: sur40 - validate number of endpoints before using them

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

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

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

commit 92461f5d723037530c1f36cce93640770037812c upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory that lie beyond the end of the endpoint
array should a malicious device lack the expected endpoints.

Fixes: bdb5c57f209c ("Input: add sur40 driver for Samsung SUR40... ")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/touchscreen/sur40.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -500,6 +500,9 @@ static int sur40_probe(struct usb_interf
 	if (iface_desc->desc.bInterfaceClass != 0xFF)
 		return -ENODEV;

+	if (iface_desc->desc.bNumEndpoints < 5)
+		return -ENODEV;
+
 	/* Use endpoint #4 (0x86). */
 	endpoint = &iface_desc->endpoint[4].desc;
 	if (endpoint->bEndpointAddress != TOUCH_ENDPOINT)