linux-kernel - [PATCH 4.10 025/111] HID: sony: Fix input device leak when connecting a DS4 twice using USB/BT

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Date:   Tue, 28 Mar 2017 14:30:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Roderick Colenbrander <roderick.colenbrander@...y.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 4.10 025/111] HID: sony: Fix input device leak when connecting a DS4 twice using USB/BT

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roderick Colenbrander <roderick.colenbrander@...y.com>

commit a687c5765b5ae19fe559e14615ddc87ebb46d409 upstream.

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@...e.cz: added stable annotation]
Fixes: ac797b95f532 ("HID: sony: Make the DS4 touchpad a separate device")
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@...y.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hid/hid-sony.c |    2 ++
 1 file changed, 2 insertions(+)

--- 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);