linux-kernel - [PATCH 3.10 181/250] Input: hanwang - validate number of endpoints before using them

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Message-Id: <1496876436-32402-182-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:59:27 +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 3.10 181/250] Input: hanwang - validate number of endpoints before using them

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

commit ba340d7b83703768ce566f53f857543359aa1b98 upstream.

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

Fixes: bba5394ad3bd ("Input: add support for Hanwang tablets")
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/hanwang.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/input/tablet/hanwang.c b/drivers/input/tablet/hanwang.c
index 5cc0412..263c85e 100644
--- a/drivers/input/tablet/hanwang.c
+++ b/drivers/input/tablet/hanwang.c
@@ -341,6 +341,9 @@ static int hanwang_probe(struct usb_interface *intf, const struct usb_device_id
 	int error;
 	int i;
 
+	if (intf->cur_altsetting->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	hanwang = kzalloc(sizeof(struct hanwang), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!hanwang || !input_dev) {
-- 
2.8.0.rc2.1.gbe9624a