From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C6AFCBA45 for ; Tue, 7 Mar 2023 17:58:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45660C433D2; Tue, 7 Mar 2023 17:58:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678211896; bh=OT4yHu1qPn+2rxL7m+FCZNHjNFEPX2XnlnWiFceUm1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sQWvCWv4n681yd08382GKPxBn1aJvy89w633aNiD8HLBH0pOLGTVFANgP7QThF3rF lu9/1gMYiIoq5CwSXBpC0sfvY/CHgxx/nAbFkFuLX/KETkj4rAdKnZiQwS82NeWgqW qPMk+A/hkTLzFd4J+ZEfWfr3MvgIN6/qB7So/gb0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pietro Borrello , Benjamin Tissoires , Stefan Ghinea Subject: [PATCH 6.1 002/885] HID: asus: use spinlock to safely schedule workers Date: Tue, 7 Mar 2023 17:48:56 +0100 Message-Id: <20230307170001.732300523@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170001.594919529@linuxfoundation.org> References: <20230307170001.594919529@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pietro Borrello commit 4ab3a086d10eeec1424f2e8a968827a6336203df upstream. Use spinlocks to deal with workers introducing a wrapper asus_schedule_work(), and several spinlock checks. Otherwise, asus_kbd_backlight_set() may schedule led->work after the structure has been freed, causing a use-after-free. Fixes: af22a610bc38 ("HID: asus: support backlight on USB keyboards") Signed-off-by: Pietro Borrello Link: https://lore.kernel.org/r/20230125-hid-unregister-leds-v4-5-7860c5763c38@diag.uniroma1.it Signed-off-by: Benjamin Tissoires Signed-off-by: Stefan Ghinea Signed-off-by: Greg Kroah-Hartman --- drivers/hid/hid-asus.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) --- a/drivers/hid/hid-asus.c +++ b/drivers/hid/hid-asus.c @@ -491,6 +491,16 @@ static int rog_nkey_led_init(struct hid_ return ret; } +static void asus_schedule_work(struct asus_kbd_leds *led) +{ + unsigned long flags; + + spin_lock_irqsave(&led->lock, flags); + if (!led->removed) + schedule_work(&led->work); + spin_unlock_irqrestore(&led->lock, flags); +} + static void asus_kbd_backlight_set(struct led_classdev *led_cdev, enum led_brightness brightness) { @@ -502,7 +512,7 @@ static void asus_kbd_backlight_set(struc led->brightness = brightness; spin_unlock_irqrestore(&led->lock, flags); - schedule_work(&led->work); + asus_schedule_work(led); } static enum led_brightness asus_kbd_backlight_get(struct led_classdev *led_cdev) @@ -526,9 +536,6 @@ static void asus_kbd_backlight_work(stru int ret; unsigned long flags; - if (led->removed) - return; - spin_lock_irqsave(&led->lock, flags); buf[4] = led->brightness; spin_unlock_irqrestore(&led->lock, flags);