From 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b Mon Sep 17 00:00:00 2001
From: Adrian Salido <salidoa@google.com>
Date: Fri, 8 Sep 2017 10:55:27 -0700
Subject: [PATCH] HID: i2c-hid: allocate hid buffers for real worst case
Git-commit: 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b
Patch-mainline: v4.14-rc4
References: bsc#1085536
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.
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Salido <salidoa@google.com>
Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/hid/i2c-hid/i2c-hid.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 77396145d2d0..9145c2129a96 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -543,7 +543,8 @@ static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
{
/* 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 */
--
2.13.6