From patchwork Sat Jun 18 01:47:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang He X-Patchwork-Id: 583785 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 413D3C433EF for ; Sat, 18 Jun 2022 02:19:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230264AbiFRCTo (ORCPT ); Fri, 17 Jun 2022 22:19:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229615AbiFRCTo (ORCPT ); Fri, 17 Jun 2022 22:19:44 -0400 X-Greylist: delayed 1880 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 17 Jun 2022 19:19:42 PDT Received: from m15112.mail.126.com (m15112.mail.126.com [220.181.15.112]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 433356A026 for ; Fri, 17 Jun 2022 19:19:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=126.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=EjjGP vuthmf5Z8jDqlrttQfgUbB5nVt8z60LWABfKwI=; b=bD7Xe2LRBrupq2bCnTEke H1XOZLfVavb55KglvUsMqxl7ikYqccbgIWYeJK7Z4uMQFYhzoblIvSgkLfrk17D+ GJVbNeI0hH/vAkeA5AG2DA24sIrMIvF+VntLIJ5NaQKc9B3FwcjobBGAMpFtS8JT GQOtZtltIHSvepaMshxAIQ= Received: from localhost.localdomain (unknown [124.16.139.61]) by smtp2 (Coremail) with SMTP id DMmowACXBAHDLq1ifz5mDg--.23118S2; Sat, 18 Jun 2022 09:47:48 +0800 (CST) From: Liang He To: tony@atomide.com, linux@armlinux.org.uk Cc: windhl@126.com, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] arm/mach-omap2: Fix refcount leak bug in omap_hwmod.c Date: Sat, 18 Jun 2022 09:47:47 +0800 Message-Id: <20220618014747.4055279-1-windhl@126.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: DMmowACXBAHDLq1ifz5mDg--.23118S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7KrW7Cr1ktr4rXr1xGF1xZrb_yoW8GrW5p3 92k395tr1UWws7J3yktFyqqrW29w1DCrWqyr9xCw1Ika1DCr4rZr4rtF90k345JFWru3WF yF4Fyw17W3Z8u3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0z__MakUUUUU= X-Originating-IP: [124.16.139.61] X-CM-SenderInfo: hzlqvxbo6rjloofrz/1tbizgUkF18RPUQLLQAAsp Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org In _init(), of_find_node_by_name() will return a node pointer with refcount incremented. We should use of_node_put() in fail path or when it is not used anymore. NOTE: As the ref will be passed from 'bus' to 'np' by the xx_lookup(), in normal exit path, we should call of_node_put() at the end use of 'np', not the end use of 'bus'. Signed-off-by: Liang He --- arch/arm/mach-omap2/omap_hwmod.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index 31d1a21f6041..007e73cc0471 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -2365,6 +2365,7 @@ static int __init _init(struct omap_hwmod *oh, void *data) r = _init_mpu_rt_base(oh, NULL, index, np); if (r < 0) { + of_node_put(bus); WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n", oh->name); return 0; @@ -2372,6 +2373,7 @@ static int __init _init(struct omap_hwmod *oh, void *data) r = _init_clocks(oh, np); if (r < 0) { + of_node_put(bus); WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name); return -EINVAL; } @@ -2385,6 +2387,8 @@ static int __init _init(struct omap_hwmod *oh, void *data) parse_module_flags(oh, child); } + of_node_put(bus); + oh->_state = _HWMOD_STATE_INITIALIZED; return 0;