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[2620:137:e000::1:20]) by mx.google.com with ESMTP id om3-20020a17090b3a8300b00213dc988b24si13774801pjb.13.2022.11.15.07.18.45; Tue, 15 Nov 2022 07:18:58 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=fss09H86; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230100AbiKOPH0 (ORCPT + 91 others); Tue, 15 Nov 2022 10:07:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230164AbiKOPHX (ORCPT ); Tue, 15 Nov 2022 10:07:23 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 523422D1C2 for ; Tue, 15 Nov 2022 07:07:22 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 113B6B8162B for ; Tue, 15 Nov 2022 15:07:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CEF7FC433D6; Tue, 15 Nov 2022 15:07:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668524839; bh=QkNQYbk7sT+LWeYMY8bXDXIsFDEOy7WD1ocCTl5Lxvw=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=fss09H86y6CN9bVN+MgYRrFI+TGRp4rHhBHLlGlwDyKjC71WuRGo+QDF1Yk4yiPxn 2jm7m7iAxxDOtCogFEqKsQGUuBUxCk5nwBcoscGU1pPmmgGeGngN68We5PG68po5iT kSdgqdT7ACt5hkpfxIBsHMAmcXUN2tk9soTXdg3ygCvbWqr1NYvSqPPiXY8atMmwse gnAeXvH7MAzml2YpBv6I5OD+XJ+UI2djd/gAvyFKGGRhrtBKGZq34rm4H+Za046AnS jn1/9MAQpQCwMs43oLPe2s4OWyV/mEHvoMiJnn5icrKvv0KrwBDE4LVzSFPWB94DJO vM+kY8DYpLI7A== Date: Wed, 16 Nov 2022 00:07:17 +0900 From: Masami Hiramatsu (Google) To: Xiu Jianfeng Cc: , , Subject: Re: [PATCH] tracing/user_events: Fix memory leak in user_event_create() Message-Id: <20221116000717.4b62513eeaf0b2296b399bda@kernel.org> In-Reply-To: <20221115014445.158419-1-xiujianfeng@huawei.com> References: <20221115014445.158419-1-xiujianfeng@huawei.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A, RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 15 Nov 2022 09:44:45 +0800 Xiu Jianfeng wrote: > Before current_user_event_group(), it has allocated memory and save it > in @name, this should freed before return error. > > Fixes: e5d271812e7a ("tracing/user_events: Move pages/locks into groups to prepare for namespaces") > Signed-off-by: Xiu Jianfeng This looks good to me. Acked-by: Masami Hiramatsu (Google) Thanks, > --- > kernel/trace/trace_events_user.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c > index ae78c2d53c8a..539b08ae7020 100644 > --- a/kernel/trace/trace_events_user.c > +++ b/kernel/trace/trace_events_user.c > @@ -1100,8 +1100,10 @@ static int user_event_create(const char *raw_command) > > group = current_user_event_group(); > > - if (!group) > + if (!group) { > + kfree(name); > return -ENOENT; > + } > > mutex_lock(&group->reg_mutex); > > -- > 2.17.1 > -- Masami Hiramatsu (Google)