linux-kernel - [PATCH 3/4] HID: logitech-hidpp: add boundary check for name retrieval

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Message-Id: <1418302280-14794-4-git-send-email-peter@lekensteyn.nl>
Date:	Thu, 11 Dec 2014 13:51:19 +0100
From:	Peter Wu <peter@...ensteyn.nl>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Nestor Lopez Casado <nlopezcasad@...itech.com>
Cc:	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] HID: logitech-hidpp: add boundary check for name retrieval

The HID response has a limited size. Do not trust the value returned by
hardware, check that it really fits in the message.

Signed-off-by: Peter Wu <peter@...ensteyn.nl>
---
 drivers/hid/hid-logitech-hidpp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 4d72c20..4292cc3 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -313,6 +313,9 @@ static char *hidpp_get_unifying_name(struct hidpp_device *hidpp_dev)
 
 	len = response.rap.params[1];
 
+	if (2 + len > sizeof(response.rap.params))
+		return NULL;
+
 	name = kzalloc(len + 1, GFP_KERNEL);
 	if (!name)
 		return NULL;
-- 
2.1.3

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