From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8170DC2D0E4 for ; Fri, 13 Nov 2020 00:16:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1F82621D79 for ; Fri, 13 Nov 2020 00:16:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=rere.qmqm.pl header.i=@rere.qmqm.pl header.b="KkIebHuv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726130AbgKMAQx (ORCPT ); Thu, 12 Nov 2020 19:16:53 -0500 Received: from rere.qmqm.pl ([91.227.64.183]:1503 "EHLO rere.qmqm.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726024AbgKMAQv (ORCPT ); Thu, 12 Nov 2020 19:16:51 -0500 Received: from remote.user (localhost [127.0.0.1]) by rere.qmqm.pl (Postfix) with ESMTPSA id 4CXJtT1cYDzKj; Fri, 13 Nov 2020 01:16:49 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rere.qmqm.pl; s=1; t=1605226609; bh=V7HSPNSozpIXr1ujMh8djMuILzn4otXrS7tNpH0CxW8=; h=Date:In-Reply-To:References:From:Subject:To:Cc:From; b=KkIebHuvOAcx+XFnOyxGphCUIRbkt9pplf3yMWzQ3od9CXifiMDaRCDWY0Ggzd10d n/JSERh/xNWdhArRDp+gZ5OpR41rtdLT6ezG9GvAxVqVGlG/lyWBXgLGHlBNuEX8Nj H3u3qXpj5g70ZdAJbOMjmTSPnSog2By5y5jveaDkCuXsIEnFaMBdSl0y+iAbwSBovU AD9oq3hBpGB+uuvd05GTU524mchsUNmay1Ja8IGlp5gSkn8B+9gUurT0gYGuhQwip6 6W5DppaPU0eSUWT2LAnlolH2WRY63qApGitGCVvDLNtWAQVTfQM8GUIGq/6SBkUyyP igS70rzWahSjA== X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.102.4 at mail Date: Fri, 13 Nov 2020 01:16:49 +0100 Message-Id: <78c3d4016cebc08d441aad18cb924b4e4d9cf9df.1605225991.git.mirq-linux@rere.qmqm.pl> In-Reply-To: References: From: =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= Subject: [PATCH 1/4] regulator: fix memory leak with repeated set_machine_constraints() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To: Liam Girdwood , Mark Brown Cc: Ahmad Fatoum , linux-arm-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fixed commit introduced a possible second call to set_machine_constraints() and that allocates memory for rdev->constraints. Move the allocation to the caller so it's easier to manage and done once. Fixes: aea6cb99703e ("regulator: resolve supply after creating regulator") Cc: stable@vger.kernel.org Signed-off-by: Michał Mirosław --- drivers/regulator/core.c | 29 +++++++++++++---------------- 1 file changed, 13 insertions(+), 16 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 2e1ea18221ef..bcd64ba21fb9 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1315,7 +1315,6 @@ static int _regulator_do_enable(struct regulator_dev *rdev); /** * set_machine_constraints - sets regulator constraints * @rdev: regulator source - * @constraints: constraints to apply * * Allows platform initialisation code to define and constrain * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: @@ -1323,21 +1322,11 @@ static int _regulator_do_enable(struct regulator_dev *rdev); * regulator operations to proceed i.e. set_voltage, set_current_limit, * set_mode. */ -static int set_machine_constraints(struct regulator_dev *rdev, - const struct regulation_constraints *constraints) +static int set_machine_constraints(struct regulator_dev *rdev) { int ret = 0; const struct regulator_ops *ops = rdev->desc->ops; - if (constraints) - rdev->constraints = kmemdup(constraints, sizeof(*constraints), - GFP_KERNEL); - else - rdev->constraints = kzalloc(sizeof(*constraints), - GFP_KERNEL); - if (!rdev->constraints) - return -ENOMEM; - ret = machine_constraints_voltage(rdev, rdev->constraints); if (ret != 0) return ret; @@ -5146,7 +5135,6 @@ struct regulator_dev * regulator_register(const struct regulator_desc *regulator_desc, const struct regulator_config *cfg) { - const struct regulation_constraints *constraints = NULL; const struct regulator_init_data *init_data; struct regulator_config *config = NULL; static atomic_t regulator_no = ATOMIC_INIT(-1); @@ -5285,14 +5273,23 @@ regulator_register(const struct regulator_desc *regulator_desc, /* set regulator constraints */ if (init_data) - constraints = &init_data->constraints; + rdev->constraints = kmemdup(&init_data->constraints, + sizeof(*rdev->constraints), + GFP_KERNEL); + else + rdev->constraints = kzalloc(sizeof(*rdev->constraints), + GFP_KERNEL); + if (!rdev->constraints) { + ret = -ENOMEM; + goto wash; + } if (init_data && init_data->supply_regulator) rdev->supply_name = init_data->supply_regulator; else if (regulator_desc->supply_name) rdev->supply_name = regulator_desc->supply_name; - ret = set_machine_constraints(rdev, constraints); + ret = set_machine_constraints(rdev); if (ret == -EPROBE_DEFER) { /* Regulator might be in bypass mode and so needs its supply * to set the constraints */ @@ -5301,7 +5298,7 @@ regulator_register(const struct regulator_desc *regulator_desc, * that is just being created */ ret = regulator_resolve_supply(rdev); if (!ret) - ret = set_machine_constraints(rdev, constraints); + ret = set_machine_constraints(rdev); else rdev_dbg(rdev, "unable to resolve supply early: %pe\n", ERR_PTR(ret)); -- 2.20.1