From patchwork Mon Nov 6 12:34:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Eckert X-Patchwork-Id: 741643 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40055C4167B for ; Mon, 6 Nov 2023 12:34:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231719AbjKFMeq (ORCPT ); Mon, 6 Nov 2023 07:34:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231648AbjKFMem (ORCPT ); Mon, 6 Nov 2023 07:34:42 -0500 Received: from mxout70.expurgate.net (mxout70.expurgate.net [194.37.255.70]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77D8BB7; Mon, 6 Nov 2023 04:34:39 -0800 (PST) Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.92) (envelope-from ) id 1qzyoG-00GOPh-VV; Mon, 06 Nov 2023 13:34:29 +0100 Received: from [195.243.126.94] (helo=securemail.tdt.de) by relay.expurgate.net with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qzyoG-00HTwR-2T; Mon, 06 Nov 2023 13:34:28 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id ABAAF24004B; Mon, 6 Nov 2023 13:34:27 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id 0589224004D; Mon, 6 Nov 2023 13:34:27 +0100 (CET) Received: from localhost.localdomain (unknown [10.2.3.40]) by mail.dev.tdt.de (Postfix) with ESMTPSA id C858B2225B; Mon, 6 Nov 2023 13:34:26 +0100 (CET) From: Florian Eckert To: Eckert.Florian@googlemail.com, gregkh@linuxfoundation.org, jirislaby@kernel.org, pavel@ucw.cz, lee@kernel.org, kabel@kernel.org, u.kleine-koenig@pengutronix.de, m.brock@vanmierlo.com Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, linux-leds@vger.kernel.org Subject: [Patch v7 2/6] leds: ledtrig-tty: free allocated ttyname buffer on deactivate Date: Mon, 6 Nov 2023 13:34:11 +0100 Message-ID: <20231106123415.3365732-3-fe@dev.tdt.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231106123415.3365732-1-fe@dev.tdt.de> References: <20231106123415.3365732-1-fe@dev.tdt.de> MIME-Version: 1.0 X-purgate-type: clean X-purgate: clean X-purgate-ID: 151534::1699274068-066056AA-98EB4578/0/0 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org The ttyname buffer for the ledtrig_tty_data struct is allocated in the sysfs ttyname_store() function. This buffer must be released on trigger deactivation. This was missing and is thus a memory leak. While we are at it, the tty handler in the ledtrig_tty_data struct should also be returned in case of the trigger deactivation call. Fixes: fd4a641ac88f ("leds: trigger: implement a tty trigger") Signed-off-by: Florian Eckert --- drivers/leds/trigger/ledtrig-tty.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/leds/trigger/ledtrig-tty.c b/drivers/leds/trigger/ledtrig-tty.c index 8ae0d2d284af..3e69a7bde928 100644 --- a/drivers/leds/trigger/ledtrig-tty.c +++ b/drivers/leds/trigger/ledtrig-tty.c @@ -168,6 +168,10 @@ static void ledtrig_tty_deactivate(struct led_classdev *led_cdev) cancel_delayed_work_sync(&trigger_data->dwork); + kfree(trigger_data->ttyname); + tty_kref_put(trigger_data->tty); + trigger_data->tty = NULL; + kfree(trigger_data); }