From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38980 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753458AbeBBRMW (ORCPT ); Fri, 2 Feb 2018 12:12:22 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vasily Averin , Peter Zijlstra , Alexander Shishkin , Arnaldo Carvalho de Melo , Hari Bathini , Jiri Olsa , Linus Torvalds , Namhyung Kim , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 4.14 116/156] perf/core: Fix memory leak triggered by perf --namespace Date: Fri, 2 Feb 2018 17:58:17 +0100 Message-Id: <20180202140845.420181724@linuxfoundation.org> In-Reply-To: <20180202140840.242829545@linuxfoundation.org> References: <20180202140840.242829545@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vasily Averin [ Upstream commit 0e18dd12064e07519f7cbff4149ca7fff620cbed ] perf with --namespace key leaks various memory objects including namespaces 4.14.0+ pid_namespace 1 12 2568 12 8 user_namespace 1 39 824 39 8 net_namespace 1 5 6272 5 8 This happen because perf_fill_ns_link_info() struct patch ns_path: during initialization ns_path incremented counters on related mnt and dentry, but without lost path_put nobody decremented them back. Leaked dentry is name of related namespace, and its leak does not allow to free unused namespace. Signed-off-by: Vasily Averin Acked-by: Peter Zijlstra Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Hari Bathini Cc: Jiri Olsa Cc: Linus Torvalds Cc: Namhyung Kim Cc: Thomas Gleixner Fixes: commit e422267322cd ("perf: Add PERF_RECORD_NAMESPACES to include namespaces related info") Link: http://lkml.kernel.org/r/c510711b-3904-e5e1-d296-61273d21118d@virtuozzo.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- kernel/events/core.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6756,6 +6756,7 @@ static void perf_fill_ns_link_info(struc ns_inode = ns_path.dentry->d_inode; ns_link_info->dev = new_encode_dev(ns_inode->i_sb->s_dev); ns_link_info->ino = ns_inode->i_ino; + path_put(&ns_path); } }