linux-kernel - [PATCH 4.6 40/96] Input: wacom_w8001

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Date:	Mon,  8 Aug 2016 21:11:03 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Chris J Arges <christopherarges@...il.com>,
	Ping Cheng <pingc@...om.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.6 40/96] Input: wacom_w8001 - ignore invalid pen data packets

4.6-stable review patch.  If anyone has any objections, please let me know.

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

From: Ping Cheng <pinglinux@...il.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@...il.com>
Tested-by: Chris J Arges <christopherarges@...il.com>
Signed-off-by: Ping Cheng <pingc@...om.com>
Reviewed-by: Peter Hutterer <peter.hutterer@...-t.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -339,6 +339,15 @@ 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;