linux-kernel - [PATCH AUTOSEL for 4.9 008/219] HID: reject input outside logical range only if null state is set

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Message-ID: <20180303222716.26640-8-alexander.levin@microsoft.com>
Date:   Sat, 3 Mar 2018 22:27:59 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Valtteri Heikkilä <rnd@....fi>,
        Tomasz Kramkowski <tk@...-tk.com>,
        Jiri Kosina <jkosina@...e.cz>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 008/219] HID: reject input outside logical
 range only if null state is set

From: Valtteri Heikkilä <rnd@....fi>

[ Upstream commit 3f3752705dbd50b66b66ad7b4d54fe33d2f746ed ]

This patch fixes an issue in drivers/hid/hid-input.c where USB HID
control null state flag is not checked upon rejecting inputs outside
logical minimum-maximum range. The check should be made according to USB
HID specification 1.11, section 6.2.2.5, p.31. The fix will resolve
issues with some game controllers, such as:
https://bugzilla.kernel.org/show_bug.cgi?id=68621

[tk@...-tk.com: shortened and fixed spelling in commit message]
Signed-off-by: Valtteri Heikkilä <rnd@....fi>
Signed-off-by: Tomasz Kramkowski <tk@...-tk.com>
Acked-By: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/hid/hid-input.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index fb9ace1cef8b..76f2527fbc60 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1156,6 +1156,7 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 	 * don't specify logical min and max.
 	 */
 	if ((field->flags & HID_MAIN_ITEM_VARIABLE) &&
+	    (field->flags & HID_MAIN_ITEM_NULL_STATE) &&
 	    (field->logical_minimum < field->logical_maximum) &&
 	    (value < field->logical_minimum ||
 	     value > field->logical_maximum)) {
-- 
2.14.1