[PATCH 4.6 40/96] Input: wacom_w8001 - ignore invalid pen data packets
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2016-08-08 19:20:28
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4.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ping Cheng <redacted> 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 <redacted> Tested-by: Chris J Arges <redacted> Signed-off-by: Ping Cheng <redacted> Reviewed-by: Peter Hutterer <redacted> 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@@ -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;