Commit 9e72ac74 authored Jun 23, 2016 by Ping Cheng Committed by Dmitry Torokhov Jun 23, 2016

Input: wacom_w8001 - ignore invalid pen data packets



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>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

parent 12afb344

drivers/input/touchscreen/wacom_w8001.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -339,6 +339,15 @@ static irqreturn_t w8001_interrupt(struct serio *serio,
		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;