From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chris J Arges , Ping Cheng , Peter Hutterer , Dmitry Torokhov Subject: [PATCH 4.6 40/96] Input: wacom_w8001 - ignore invalid pen data packets Date: Mon, 8 Aug 2016 21:11:03 +0200 Message-Id: <20160808180245.645748576@linuxfoundation.org> In-Reply-To: <20160808180243.898163389@linuxfoundation.org> References: <20160808180243.898163389@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ping Cheng 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 Tested-by: Chris J Arges Signed-off-by: Ping Cheng Reviewed-by: Peter Hutterer Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- 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;