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HID: wacom: Skip processing of touches with negative slot values

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The `input_mt_get_slot_by_key` function may return a negative value
if an error occurs (e.g. running out of slots). If this occurs we
should really avoid reporting any data for the slot.

Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jason Gerecke 2021-07-19 13:55:31 -07:00 • committed by Jiri Kosina
parent 6ca2350e11
commit 7cc8524f65
1 changed files with 3 additions and 0 deletions
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3
drivers/hid/wacom_wac.c
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@ -2548,6 +2548,9 @@ static void wacom_wac_finger_slot(struct wacom_wac *wacom_wac,
int slot; int slot;
slot = input_mt_get_slot_by_key(input, hid_data->id); slot = input_mt_get_slot_by_key(input, hid_data->id);
if (slot < 0)
return;
input_mt_slot(input, slot); input_mt_slot(input, slot);
input_mt_report_slot_state(input, MT_TOOL_FINGER, prox); input_mt_report_slot_state(input, MT_TOOL_FINGER, prox);
} }