Commit b4b583d4 authored Oct 31, 2011 by Jiri Kosina

HID: be more strict when ignoring out-of-range fields



HID 1.11 specification, section 5.10 tells us:

	HID class devices support the ability to ignore selected fields in a
	report at run- time. This is accomplished by declaring bit field in a
	report that is capable of containing a range of values larger than
	those actually generated by the control. If the host or the device
	receives an out-of-range value then the current value for the
	respective control will not be modified.

So we shouldn't be restricted to EV_ABS only.

Reported-by: Denilson Figueiredo de Sá <denilsonsa@gmail.com>
Tested-by: Denilson Figueiredo de Sá <denilsonsa@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

parent 6da70669

drivers/hid/hid-input.c

+2 −3

Original line number	Diff line number	Diff line
		@@ -822,9 +822,8 @@ void hidinput_hid_event(struct hid_device hid, struct hid_field field, struct
		return;
		}

		/* Ignore absolute values that are out of bounds */
		if ((usage->type == EV_ABS && (value < field->logical_minimum \|\|
		value > field->logical_maximum))) {
		/* Ignore out-of-range values as per HID specification, section 5.10 */
		if (value < field->logical_minimum \|\| value > field->logical_maximum) {
		dbg_hid("Ignoring out-of-range value %x\n", value);
		return;
		}