From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brent Adam Subject: [PATCH] USB: HID: Fix fields from pen report ID being interpreted for multitouch. Date: Tue, 9 Jun 2015 14:31:57 -0600 Message-ID: <1433881917-3627-1-git-send-email-brentadam@smarttech.com> Return-path: Received: from mail-pa0-f68.google.com ([209.85.220.68]:34166 "EHLO mail-pa0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753791AbbFIUcc (ORCPT ); Tue, 9 Jun 2015 16:32:32 -0400 Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: jkosina@suse.cz Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Brent Adam Fields like HID_DG_CONTACTCOUNT are outside of the physical collection, but within the application collection and report ID. Make sure to catch those fields that are not part of the mt_report_id and return 0 so they can be processed with the pen. Otherwise, the wrong HID_DG_CONTACTCOUNT will be applied to cc_index and result in dereferencing a null pointer in mt_touch_report. Signed-off-by: Brent Adam --- drivers/hid/hid-multitouch.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 6a9b05b..2ee8800 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -781,6 +781,9 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi, */ if (field->physical == HID_DG_STYLUS) return 0; + else if ((field->physical == 0) && + (field->report->id != td->mt_report_id)) + return 0; if (field->application == HID_DG_TOUCHSCREEN || field->application == HID_DG_TOUCHPAD) -- 2.1.4