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[130.37.198.127]) by smtp.gmail.com with ESMTPSA id f19-20020a170906391300b0088452ca0666sm4898956eje.196.2023.01.31.05.09.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Jan 2023 05:09:02 -0800 (PST) From: Pietro Borrello Date: Tue, 31 Jan 2023 13:08:48 +0000 Subject: [PATCH v2 4/5] HID: dualshock4_remove: manually unregister leds MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20230125-hid-unregister-leds-v2-4-689cc62fc878@diag.uniroma1.it> References: <20230125-hid-unregister-leds-v2-0-689cc62fc878@diag.uniroma1.it> In-Reply-To: <20230125-hid-unregister-leds-v2-0-689cc62fc878@diag.uniroma1.it> To: Jiri Kosina , Benjamin Tissoires , Hanno Zulla , Pavel Machek , Lee Jones , Roderick Colenbrander , Sven Eckelmann Cc: linux-leds@vger.kernel.org, Cristiano Giuffrida , "Bos, H.J." , Jakob Koschel , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Jiri Kosina , Roderick Colenbrander , Pietro Borrello X-Mailer: b4 0.11.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1675170540; l=1491; i=borrello@diag.uniroma1.it; s=20221223; h=from:subject:message-id; bh=VPrVVBqqogjSwkjTCQxGFur+jXJWf031MbQaC/naVuk=; b=a5Fi08feBch0WK2QkEw6jb2k0YeWIxIy0TOvIlH4YFQDjzx5YCPMMBiXJ+X1wwE3U5mdz9JHAVyg S53Yt4moDbGRX18ytJbn1h1YkW4eu7pgIyCWWt7/3d1Y4VCSvbfP X-Developer-Key: i=borrello@diag.uniroma1.it; a=ed25519; pk=4xRQbiJKehl7dFvrG33o2HpveMrwQiUPKtIlObzKmdY= Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Unregister the LED controllers before device removal, to prevent unnecessary runs of dualshock4_led_set_brightness(). Fixes: 4521109a8f40 ("HID: playstation: support DualShock4 lightbar.") Signed-off-by: Pietro Borrello --- Contrary to the other patches in this series, failing to unregister the led controller does not results into a use-after-free thanks to the output_worker_initialized variable and the spinlock checks. Changes in v2: - Clarify UAF - Link to v1: https://lore.kernel.org/all/20230125-hid-unregister-leds-v1-4-9a5192dcef16@diag.uniroma1.it/ --- drivers/hid/hid-playstation.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c index f23186ca2d76..b41657842e26 100644 --- a/drivers/hid/hid-playstation.c +++ b/drivers/hid/hid-playstation.c @@ -2434,11 +2434,15 @@ static void dualshock4_remove(struct ps_device *ps_dev) { struct dualshock4 *ds4 = container_of(ps_dev, struct dualshock4, base); unsigned long flags; + int i; spin_lock_irqsave(&ds4->base.lock, flags); ds4->output_worker_initialized = false; spin_unlock_irqrestore(&ds4->base.lock, flags); + for (i = 0; i < ARRAY_SIZE(ds4->lightbar_leds); i++) + devm_led_classdev_unregister(&ps_dev->hdev->dev, &ds4->lightbar_leds[i]); + cancel_work_sync(&ds4->output_worker); if (ps_dev->hdev->product == USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE) -- 2.25.1