Patch "HID: i2c-hid: allocate hid buffers for real worst case" has been added to the 4.4-stable tree

Patch "HID: i2c-hid: allocate hid buffers for real worst case" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    HID: i2c-hid: allocate hid buffers for real worst case

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hid-i2c-hid-allocate-hid-buffers-for-real-worst-case.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>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: HID: i2c-hid: allocate hid buffers for real worst case

From: Adrian Salido <salidoa@google.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@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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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
@@ -540,7 +540,8 @@ 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 */


Patches currently in stable-queue which might be from salidoa@google.com are

queue-4.4/hid-i2c-hid-allocate-hid-buffers-for-real-worst-case.patch