From patchwork Tue Oct 27 13:55:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 312304 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 1FB6FC55179 for ; Tue, 27 Oct 2020 16:32:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C877E218AC for ; Tue, 27 Oct 2020 16:32:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603816360; bh=a+BJ7GJFIleTVPFL9oPqI9yETMNmCOB+dSc4uY2elB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WLAXKYDokDAl3J6lihs5Erxn2lQXIIdHKR9FvvYTCQcPWG4K1sZb5/LA6/OxiBbBx TM3GbZ7uvh4AsRjx/Gdl1WJA5klFDJHuyahO6+S4JxSOW9udPn2do+u6qJKw9llACJ hJV7uTijsl+1oRe1BJ1u8OfQvGxp6UdO4euKjBdY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1809971AbgJ0Qcj (ORCPT ); Tue, 27 Oct 2020 12:32:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:50138 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1802505AbgJ0Pts (ORCPT ); Tue, 27 Oct 2020 11:49:48 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E9EBB2072C; Tue, 27 Oct 2020 15:49:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603813787; bh=a+BJ7GJFIleTVPFL9oPqI9yETMNmCOB+dSc4uY2elB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=y9v3VFu+3/aIpC+ywt+O+onSumK1QjnziTaty+2TpHNjJCLc9WVST3qD2H+7tMgxw xejEDwm87STkpy10hfm9uqhTQ8IlnzOQR2RwCISepg970CdwlPzTA6mbI+MVz29vo/ 3/oEkDyUeTrMmN510KllaVE9eIGiQdUrL7xyseCk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Aring , David Teigland , Sasha Levin Subject: [PATCH 5.9 670/757] fs: dlm: fix configfs memory leak Date: Tue, 27 Oct 2020 14:55:20 +0100 Message-Id: <20201027135521.971208514@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135450.497324313@linuxfoundation.org> References: <20201027135450.497324313@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alexander Aring [ Upstream commit 3d2825c8c6105b0f36f3ff72760799fa2e71420e ] This patch fixes the following memory detected by kmemleak and umount gfs2 filesystem which removed the last lockspace: unreferenced object 0xffff9264f482f600 (size 192): comm "dlm_controld", pid 325, jiffies 4294690276 (age 48.136s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 6e 6f 64 65 73 00 00 00 ........nodes... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000060481d7>] make_space+0x41/0x130 [<000000008d905d46>] configfs_mkdir+0x1a2/0x5f0 [<00000000729502cf>] vfs_mkdir+0x155/0x210 [<000000000369bcf1>] do_mkdirat+0x6d/0x110 [<00000000cc478a33>] do_syscall_64+0x33/0x40 [<00000000ce9ccf01>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 The patch just remembers the "nodes" entry pointer in space as I think it's created as subdirectory when parent "spaces" is created. In function drop_space() we will lost the pointer reference to nds because configfs_remove_default_groups(). However as this subdirectory is always available when "spaces" exists it will just be freed when "spaces" will be freed. Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin --- fs/dlm/config.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/dlm/config.c b/fs/dlm/config.c index 47f0b98b707f8..f33a7e4ae917b 100644 --- a/fs/dlm/config.c +++ b/fs/dlm/config.c @@ -221,6 +221,7 @@ struct dlm_space { struct list_head members; struct mutex members_lock; int members_count; + struct dlm_nodes *nds; }; struct dlm_comms { @@ -430,6 +431,7 @@ static struct config_group *make_space(struct config_group *g, const char *name) INIT_LIST_HEAD(&sp->members); mutex_init(&sp->members_lock); sp->members_count = 0; + sp->nds = nds; return &sp->group; fail: @@ -451,6 +453,7 @@ static void drop_space(struct config_group *g, struct config_item *i) static void release_space(struct config_item *i) { struct dlm_space *sp = config_item_to_space(i); + kfree(sp->nds); kfree(sp); }