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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 03359C43387 for ; Tue, 18 Dec 2018 16:43:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C8D20218A2 for ; Tue, 18 Dec 2018 16:43:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545151382; bh=5WC7GSKRjy0uI/1uUerwSs1j+1qP5CaOJVcrwTnYro8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ctwOqfWcuyvD0Zi5gPza0M9hKiu9lfxujTT/MgdDq2qBh2gBCcelyzns3w3IUtfoP 9OuaOl178oqu05/Ouwqv+45RWz5QBXUH0r455DBB06nOE6HrQmn1Eo3g4vgMnjQZfh 4IFvTM1RwdRMZySO8+08opK0G3oTdZrvb/q5qfY4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727589AbeLRQlp (ORCPT ); Tue, 18 Dec 2018 11:41:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:39254 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726822AbeLRQlk (ORCPT ); Tue, 18 Dec 2018 11:41:40 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (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 D61F421873; Tue, 18 Dec 2018 16:41:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545151300; bh=5WC7GSKRjy0uI/1uUerwSs1j+1qP5CaOJVcrwTnYro8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oGSi182JahpsNTSMKHeIbrsCwTm1Z1KcW/cMBYg0iVv25mW63P3E3xTk6rCgv9ESi 9wnk2HNEzS1459JYxR8xft3+h/ZJRp2L0oDFI7Xkh3QAfwDQkaD53G4/rjdIKrMKk3 ndrMkeFwhHxYNy3DMuhkc9bwsAGYNXiylc4m7VM4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tom Zanussi , "Steven Rostedt (VMware)" Subject: [PATCH 4.19 28/44] tracing: Fix memory leak in set_trigger_filter() Date: Tue, 18 Dec 2018 17:39:40 +0100 Message-Id: <20181218163930.774006911@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20181218163927.119623235@linuxfoundation.org> References: <20181218163927.119623235@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steven Rostedt (VMware) commit 3cec638b3d793b7cacdec5b8072364b41caeb0e1 upstream. When create_event_filter() fails in set_trigger_filter(), the filter may still be allocated and needs to be freed. The caller expects the data->filter to be updated with the new filter, even if the new filter failed (we could add an error message by setting set_str parameter of create_event_filter(), but that's another update). But because the error would just exit, filter was left hanging and nothing could free it. Found by kmemleak detector. Cc: stable@vger.kernel.org Fixes: bac5fb97a173a ("tracing: Add and use generic set_trigger_filter() implementation") Reviewed-by: Tom Zanussi Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Greg Kroah-Hartman --- kernel/trace/trace_events_trigger.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/kernel/trace/trace_events_trigger.c +++ b/kernel/trace/trace_events_trigger.c @@ -732,8 +732,10 @@ int set_trigger_filter(char *filter_str, /* The filter is for the 'trigger' event, not the triggered event */ ret = create_event_filter(file->event_call, filter_str, false, &filter); - if (ret) - goto out; + /* + * If create_event_filter() fails, filter still needs to be freed. + * Which the calling code will do with data->filter. + */ assign: tmp = rcu_access_pointer(data->filter);