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HID: reject input outside logical range only if null state is set 

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@the-tk.com: shortened and fixed spelling in commit message]
Signed-off-by: Valtteri Heikkilä <rnd@nic.fi>
Signed-off-by: Tomasz Kramkowski <tk@the-tk.com>
Acked-By: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Valtteri Heikkilä 2017-02-14 23:14:32 +00:00 committed by Jiri Kosina
parent 81bbef23db
commit 3f3752705d
1 changed files with 1 additions and 0 deletions
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drivers/hid/hid-input.c
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@ -1157,6 +1157,7 @@ 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)) {