linux-kernel - [PATCH 5/5] HID: sony_remove: manually unregister leds

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Message-Id: <20230125-hid-unregister-leds-v1-5-9a5192dcef16@diag.uniroma1.it>
Date:   Thu, 26 Jan 2023 00:24:57 +0000
From:   Pietro Borrello <borrello@...g.uniroma1.it>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Hanno Zulla <kontakt@...no.de>,
        Carlo Caione <carlo@...lessm.com>, Pavel Machek <pavel@....cz>,
        Lee Jones <lee@...nel.org>,
        Roderick Colenbrander <roderick.colenbrander@...y.com>,
        Sven Eckelmann <sven@...fation.org>
Cc:     linux-leds@...r.kernel.org,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>, Jakob Koschel <jkl820.git@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Kosina <jkosina@...e.cz>,
        Roderick Colenbrander <roderick@...kai.com>,
        Pietro Borrello <borrello@...g.uniroma1.it>
Subject: [PATCH 5/5] HID: sony_remove: manually unregister leds

Unregister the LED controller before device removal, as
sony_led_set_brightness() may schedule sc->state_worker
after the structure has been freed, causing a use-after-free.

Fixes: 0a286ef27852 ("HID: sony: Add LED support for Sixaxis/Dualshock3 USB")
Signed-off-by: Pietro Borrello <borrello@...g.uniroma1.it>
---
 drivers/hid/hid-sony.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 13125997ab5e..146677c8319c 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -3083,6 +3083,7 @@ static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
 static void sony_remove(struct hid_device *hdev)
 {
 	struct sony_sc *sc = hid_get_drvdata(hdev);
+	int n;
 
 	if (sc->quirks & (GHL_GUITAR_PS3WIIU | GHL_GUITAR_PS4)) {
 		del_timer_sync(&sc->ghl_poke_timer);
@@ -3100,6 +3101,13 @@ static void sony_remove(struct hid_device *hdev)
 	if (sc->hw_version_created)
 		device_remove_file(&sc->hdev->dev, &dev_attr_hardware_version);
 
+	if (sc->quirks & SONY_LED_SUPPORT) {
+		for (n = 0; n < sc->led_count; n++) {
+			if (sc->leds[n])
+				devm_led_classdev_unregister(&hdev->dev, sc->leds[n]);
+		}
+	}
+
 	sony_cancel_work_sync(sc);
 
 	sony_remove_dev_list(sc);

-- 
2.25.1