Patch "Input: wacom_w8001 - ignore invalid pen data packets" has been added to the 4.4-stable tree

Patch "Input: wacom_w8001 - ignore invalid pen data packets" 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

    Input: wacom_w8001 - ignore invalid pen data packets

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:
     input-wacom_w8001-ignore-invalid-pen-data-packets.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 9e72ac7492149a229ce9039c680849cb682d7092 Mon Sep 17 00:00:00 2001
From: Ping Cheng <pinglinux@gmail.com>
Date: Thu, 23 Jun 2016 10:55:11 -0700
Subject: Input: wacom_w8001 - ignore invalid pen data packets

From: Ping Cheng <pinglinux@gmail.com>

commit 9e72ac7492149a229ce9039c680849cb682d7092 upstream.

ThinkPad X60 Tablet PC (pen only device) sometime posts
packets that are larger than W8001_PKTLEN_TPCPEN.

Reported-by: Chris J Arges <christopherarges@gmail.com>
Tested-by: Chris J Arges <christopherarges@gmail.com>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/input/touchscreen/wacom_w8001.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/input/touchscreen/wacom_w8001.c
+++ b/drivers/input/touchscreen/wacom_w8001.c
@@ -342,6 +342,15 @@ static irqreturn_t w8001_interrupt(struc
 		w8001->idx = 0;
 		parse_multi_touch(w8001);
 		break;
+
+	default:
+		/*
+		 * ThinkPad X60 Tablet PC (pen only device) sometimes
+		 * sends invalid data packets that are larger than
+		 * W8001_PKTLEN_TPCPEN. Let's start over again.
+		 */
+		if (!w8001->touch_dev && w8001->idx > W8001_PKTLEN_TPCPEN - 1)
+			w8001->idx = 0;
 	}
 
 	return IRQ_HANDLED;


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

queue-4.4/input-wacom_w8001-w8001_max_length-should-be-13.patch
queue-4.4/input-wacom_w8001-ignore-invalid-pen-data-packets.patch