linux-kernel - [PATCH 5/7] Input: hanwang

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Message-Id: <20170313123539.28103-6-johan@kernel.org>
Date:   Mon, 13 Mar 2017 13:35:37 +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>,
        Xing Wei <weixing@...wang.com.cn>,
        Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 5/7] Input: hanwang - fix NULL-deref at probe

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")
Cc: stable <stable@...r.kernel.org>	# 2.6.37
Cc: Xing Wei <weixing@...wang.com.cn>
Cc: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 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 cd852059b99e..df4bea96d7ed 100644
--- a/drivers/input/tablet/hanwang.c
+++ b/drivers/input/tablet/hanwang.c
@@ -340,6 +340,9 @@ 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) {
-- 
2.12.0