From 83e9919797fec17ce46e24ab7b92f9066929fdd2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ahelenia=20Ziemia=C5=84ska?= Date: Tue, 15 Jun 2021 01:56:34 +0000 Subject: [PATCH] HID: multitouch: require Finger field to mark Win8 reports as MT MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit stable inclusion from stable-5.10.43 commit 127f25be2ff0fb3706adf4cf91a0e18c43b59885 bugzilla: 109284 CVE: NA -------------------------------- commit a2353e3b26012ff43bcdf81d37a3eaddd7ecdbf3 upstream. This effectively changes collection_is_mt from contact ID in report->field to (device is Win8 => collection is finger) && contact ID in report->field Some devices erroneously report Pen for fingers, and Win8 stylus-on-touchscreen devices report contact ID, but mark the accompanying touchscreen device's collection correctly Cc: stable@vger.kernel.org Signed-off-by: Ahelenia Ziemiańska Acked-by: Benjamin Tissoires Signed-off-by: Jiri Kosina Signed-off-by: Greg Kroah-Hartman Signed-off-by: Chen Jun Signed-off-by: Zheng Zengkai --- drivers/hid/hid-multitouch.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 8429ebe7097e..8580ace596c2 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -604,9 +604,13 @@ static struct mt_report_data *mt_allocate_report_data(struct mt_device *td, if (!(HID_MAIN_ITEM_VARIABLE & field->flags)) continue; - for (n = 0; n < field->report_count; n++) { - if (field->usage[n].hid == HID_DG_CONTACTID) - rdata->is_mt_collection = true; + if (field->logical == HID_DG_FINGER || td->hdev->group != HID_GROUP_MULTITOUCH_WIN_8) { + for (n = 0; n < field->report_count; n++) { + if (field->usage[n].hid == HID_DG_CONTACTID) { + rdata->is_mt_collection = true; + break; + } + } } } -- GitLab