Patch "HID: cp2112: fix to force single data-report reply" has been added to the 4.1-stable tree

Patch "HID: cp2112: fix to force single data-report reply" has been added to the 4.1-stable tree

[gregkh]

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

    HID: cp2112: fix to force single data-report reply

to the 4.1-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-cp2112-fix-to-force-single-data-report-reply.patch
and it can be found in the queue-4.1 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 6debce6f4e787a8eb4cec94e7afa85fb4f40db27 Mon Sep 17 00:00:00 2001
From: Antonio Borneo <borneo.antonio@gmail.com>
Date: Sun, 21 Jun 2015 14:20:25 +0800
Subject: HID: cp2112: fix to force single data-report reply

From: Antonio Borneo <borneo.antonio@gmail.com>

commit 6debce6f4e787a8eb4cec94e7afa85fb4f40db27 upstream.

Current implementation of cp2112_raw_event() only accepts one data report at a
time. If last received data report is not fully handled yet, a new incoming
data report will overwrite it. In such case we don't guaranteed to propagate
the correct incoming data.

The trivial fix implemented here forces a single report at a time by requesting
in cp2112_read() no more than 61 byte of data, which is the payload size of a
single data report.

Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: Ellen Wang <ellen@cumulusnetworks.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hid/hid-cp2112.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/hid/hid-cp2112.c
+++ b/drivers/hid/hid-cp2112.c
@@ -356,6 +356,8 @@ static int cp2112_read(struct cp2112_dev
 	struct cp2112_force_read_report report;
 	int ret;
 
+	if (size > sizeof(dev->read_data))
+		size = sizeof(dev->read_data);
 	report.report = CP2112_DATA_READ_FORCE_SEND;
 	report.length = cpu_to_be16(size);
 


Patches currently in stable-queue which might be from borneo.antonio@gmail.com are

queue-4.1/hid-cp2112-fix-to-force-single-data-report-reply.patch