linux-kernel - [PATCH 3.16 005/204] HID: i2c-hid: allocate hid buffers for real worst case

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Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Benson Leung" <bleung@...omium.org>,
        "Jiri Kosina" <jkosina@...e.cz>,
        "Dmitry Torokhov" <dmitry.torokhov@...il.com>,
        "Adrian Salido" <salidoa@...gle.com>,
        "Guenter Roeck" <groeck@...omium.org>
Subject: [PATCH 3.16 005/204] HID: i2c-hid: allocate hid buffers for real
 worst case

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Adrian Salido <salidoa@...gle.com>

commit 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b upstream.

The buffer allocation is not currently accounting for an extra byte for
the report id. This can cause an out of bounds access in function
i2c_hid_set_or_send_report() with reportID > 15.

Signed-off-by: Adrian Salido <salidoa@...gle.com>
Reviewed-by: Benson Leung <bleung@...omium.org>
Signed-off-by: Guenter Roeck <groeck@...omium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hid/i2c-hid/i2c-hid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -526,7 +526,8 @@ static int i2c_hid_alloc_buffers(struct
 {
 	/* the worst case is computed from the set_report command with a
 	 * reportID > 15 and the maximum report length */
-	int args_len = sizeof(__u8) + /* optional ReportID byte */
+	int args_len = sizeof(__u8) + /* ReportID */
+		       sizeof(__u8) + /* optional ReportID byte */
 		       sizeof(__u16) + /* data register */
 		       sizeof(__u16) + /* size of the report */
 		       report_size; /* report */