From nobody Fri Feb 13 14:10:36 2026 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 56712CE7A96 for ; Mon, 25 Sep 2023 14:28:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232336AbjIYO2y (ORCPT ); Mon, 25 Sep 2023 10:28:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43002 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232313AbjIYO2t (ORCPT ); Mon, 25 Sep 2023 10:28:49 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82369103; Mon, 25 Sep 2023 07:28:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.de; s=s31663417; t=1695652105; x=1696256905; i=w_armin@gmx.de; bh=071gcdDLNBkCgiGL7swJLhOyDt5nxBTUzKca3uuN28I=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=jAhHtiLe0mXfe5UVvmsdPX9jfFWA1024EWDUdqqkw0pSUm8yjVOOCieVqQ0bVbpeCQxWXfh/wWD vJWW34+3v+huqyI6lr/SBmbXI4BqkylgPon3Yom3mheZN9CfV/hgKneP2SGrH6Sc/JRtXh7fcyV+2 MWMQBvnX64jVx3qbRqrhFRYZR3l7P0qNUWQHTTJjkVoy/CzAjLbeJpRyGE05wVZtKAZuUzX8R4gsa BUdb1qMSkJpBViOHTb7xvzfA3J5KxwTOsjkptpzU3RYSJ6v7QUnuLW0znml5oZlLIbyiDZoRCgpIB owkVmghaLFmTo58iZItYH63l++lY+HGRHagw== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from mx-amd-b650.users.agdsn.de ([141.30.226.129]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MDQiS-1qvGyF0ntG-00AVWy; Mon, 25 Sep 2023 16:28:25 +0200 From: Armin Wolf To: markpearson@lenovo.com, jorge.lopez2@hp.com Cc: hdegoede@redhat.com, markgross@kernel.org, ilpo.jarvinen@linux.intel.com, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/2] platform/x86: think-lmi: Fix reference leak Date: Mon, 25 Sep 2023 16:28:18 +0200 Message-Id: <20230925142819.74525-2-W_Armin@gmx.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230925142819.74525-1-W_Armin@gmx.de> References: <20230925142819.74525-1-W_Armin@gmx.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:xLW589ADbeBLaSbObW/IkKlsPjnKinoeWFHFlYP2yKvjOxeMix8 tdH0CEbnJayZjjm/mr1pbvi56B/IKWGdkBL5BFEnC/AXdXRYPJ+5RD/3ZOPl6yL6zBSoH8j /gaxh0qorTWzE4tcIPq0vFxexNWee0VdCBZxXZRqLZH4ZFehyciEgNXHtKuPnvVJOIvi1Xb rVLF8F0sHGINhq1/tWQ3g== UI-OutboundReport: notjunk:1;M01:P0:DBTTDir0fBc=;/3Xslu3UF0jR4+NVqaPx8Dqb8zZ dM/LHUyK+XDNJArl7D4LGGWhQSMPK5fmlnyOLvKebr5bB5RYYwAMPnwj3WWmYqt8eo2aptPdv OADuvWhgiPfJMrFkEM5kPGVFH+c3NGL1l5ZeDqdgCfgvfPY7J2sd2RtgEttKUBj/u9Av6rvRC PI//uiEe+L6noLQKtQrHoBUKEDLa0iNoWLX9ifU9nAXWUNpH353gfZg0LC/pTn3NZIyxz7iI1 GI4S2cQYzGBGvQg98V/HafMm+eKApFAU6JEZ1ZesBofM3rPTSF/5I+8r4DQR0i0VW6FdqAHP2 NoC5VY1iqNc+Qa2oR0N3zQi4waUlo6FirvH+srgYFSTdftDKqEZcwyOZKkZ8omOCeILHAFaNc N7gTp0TKtkg4TGB54RTZ+ADaRAJLFt1hTNjOR65qPBooOVSE0BaLHXqOL1rOhKC7Kle16hM13 rZDdwG+/oHr7XB70qSR976vLJDzNyeblZSuU98ZDBOz3EmMLIGw2N+Qo4J8as+QW5XXLQZjpZ usfk3s/QTaakbceoHgVMyAcl0CZS9F0zM5HxCBqXl5Gq+G6G+QLNEsi/PIFCI9QJZu8b0oTUW Aj2pEnpCS3jM9i1Lg4BzPH35veaAu8d0y9dJOnMF3bhE9vtiJYbVy9Tu9DHGICfOa9CjC94/S DoELJVzVirWfGz0SPYJpZllU08Q5G0c0YAvj3IIfnOrldFI9GLoMzgzo2eSuJ9Haric2+XpgD oFwVU09j3VX/B/7jp3p8c5mrGWUw82Gt0MYGZj3MUKi8v+jArQ40cURDmZgSylIprD5JNU9Aw GCvso72kenBUUCH86+hAk1carRvmtqJ+GKNWsPHhsiBaKy58QfUUDHDLRTvo1ko46tDXtjmfd m/NaysBnRVlII3X2qnjMwbQJZfG6a48QSnqBrtjvYEaNFdzVI3xtTToDG9S3oXm+Z5mc/xN7K XpF/lZpW0HeWYgQOuJkozTQ50rg= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If a duplicate attribute is found using kset_find_obj(), a reference to that attribute is returned which needs to be disposed accordingly using kobject_put(). Move the setting name validation into a separate function to allow for this change without having to duplicate the cleanup code for this setting. As a side note, a very similar bug was fixed in commit 7295a996fdab ("platform/x86: dell-sysman: Fix reference leak"), so it seems that the bug was copied from that driver. Compile-tested only. Fixes: 1bcad8e510b2 ("platform/x86: think-lmi: Fix issues with duplicate at= tributes") Reviewed-by: Mark Pearson Reviewed-by: Ilpo J=C3=A4rvinen Signed-off-by: Armin Wolf --- Changes in v4: - add another Reviewed-by Changes in v3: - add Reviewed-by Changes in v2: - no changes --- drivers/platform/x86/think-lmi.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-= lmi.c index 4be6f28d4600..3a396b763c49 100644 --- a/drivers/platform/x86/think-lmi.c +++ b/drivers/platform/x86/think-lmi.c @@ -1344,6 +1344,24 @@ static void tlmi_release_attr(void) kset_unregister(tlmi_priv.authentication_kset); } +static int tlmi_validate_setting_name(struct kset *attribute_kset, char *n= ame) +{ + struct kobject *duplicate; + + if (!strcmp(name, "Reserved")) + return -EINVAL; + + duplicate =3D kset_find_obj(attribute_kset, name); + if (duplicate) { + pr_debug("Duplicate attribute name found - %s\n", name); + /* kset_find_obj() returns a reference */ + kobject_put(duplicate); + return -EBUSY; + } + + return 0; +} + static int tlmi_sysfs_init(void) { int i, ret; @@ -1372,10 +1390,8 @@ static int tlmi_sysfs_init(void) continue; /* check for duplicate or reserved values */ - if (kset_find_obj(tlmi_priv.attribute_kset, tlmi_priv.setting[i]->displa= y_name) || - !strcmp(tlmi_priv.setting[i]->display_name, "Reserved")) { - pr_debug("duplicate or reserved attribute name found - %s\n", - tlmi_priv.setting[i]->display_name); + if (tlmi_validate_setting_name(tlmi_priv.attribute_kset, + tlmi_priv.setting[i]->display_name) < 0) { kfree(tlmi_priv.setting[i]->possible_values); kfree(tlmi_priv.setting[i]); tlmi_priv.setting[i] =3D NULL; -- 2.39.2