linux-kernel - [PATCH 7/7] Input: sur40

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Message-Id: <20170313123539.28103-8-johan@kernel.org>
Date:   Mon, 13 Mar 2017 13:35:39 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        stable <stable@...r.kernel.org>,
        Florian Echtler <floe@...terbrot.org>,
        David Herrmann <dh.herrmann@...il.com>,
        Henrik Rydberg <rydberg@...omail.se>
Subject: [PATCH 7/7] Input: sur40 - fix NULL-deref at probe

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 (aka MS
Surface 2.0/Pixelsense)")
Cc: stable <stable@...r.kernel.org>	# 3.13
Cc: Florian Echtler <floe@...terbrot.org>
Cc: David Herrmann <dh.herrmann@...il.com>
Cc: Henrik Rydberg <rydberg@...omail.se>

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/input/touchscreen/sur40.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
index aefb6e11f88a..4c0eecae065c 100644
--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -527,6 +527,9 @@ static int sur40_probe(struct usb_interface *interface,
 	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)
-- 
2.12.0