HID: sony: Fix input device leak when connecting a DS4 twice using USB/BT

When a user connects a DS4 twice using USB and BT, we reject the
second device connection after the setup work. We then perform
a cleanup, but during cleanup we are not removing the touchpad
device. This leads to leakage of an input device, which we would
never remove. It can likely result into a kernel oops as well
when the touchpad evdev node is accessed and the underlaying HID
device has been removed from the system.

[jkosina@suse.cz: added stable annotation]
Fixes: ac797b95f532 ("HID: sony: Make the DS4 touchpad a separate device")
Cc: stable@vger.kernel.org
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index f405b07d03816506215bd19fe3c878393370484a..740996f9bdd49dde3d26659f68d2addbff291c60 100644 (file)
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -2632,6 +2632,8 @@ err_stop:
                sony_leds_remove(sc);
        if (sc->quirks & SONY_BATTERY_SUPPORT)
                sony_battery_remove(sc);
+       if (sc->touchpad)
+               sony_unregister_touchpad(sc);
        sony_cancel_work_sync(sc);
        kfree(sc->output_report_dmabuf);
        sony_remove_dev_list(sc);