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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 27278C433E0 for ; Thu, 4 Jun 2020 14:15:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 085212063A for ; Thu, 4 Jun 2020 14:15:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728902AbgFDOPb (ORCPT ); Thu, 4 Jun 2020 10:15:31 -0400 Received: from mail2-relais-roc.national.inria.fr ([192.134.164.83]:58819 "EHLO mail2-relais-roc.national.inria.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728496AbgFDOPb (ORCPT ); Thu, 4 Jun 2020 10:15:31 -0400 X-IronPort-AV: E=Sophos;i="5.73,472,1583190000"; d="scan'208";a="453003555" Received: from abo-173-121-68.mrs.modulonet.fr (HELO hadrien) ([85.68.121.173]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Jun 2020 16:15:29 +0200 Date: Thu, 4 Jun 2020 16:15:29 +0200 (CEST) From: Julia Lawall X-X-Sender: jll@hadrien To: Denis Efremov cc: cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org Subject: Re: [PATCH] coccinelle: api: add kzfree script In-Reply-To: <20200604140805.111613-1-efremov@linux.com> Message-ID: References: <20200604140805.111613-1-efremov@linux.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 4 Jun 2020, Denis Efremov wrote: > Check for memset() with 0 followed by kfree(). > > Signed-off-by: Denis Efremov > --- > Patches: > 1. kzfree in drivers/w1 https://lkml.org/lkml/2020/6/4/438 > 2. kzfree in drivers/iommu/ https://lkml.org/lkml/2020/6/4/421 > 3. kzfree in drivers/scsi/ https://lkml.org/lkml/2020/6/4/442 > > scripts/coccinelle/api/kzfree.cocci | 53 +++++++++++++++++++++++++++++ > 1 file changed, 53 insertions(+) > create mode 100644 scripts/coccinelle/api/kzfree.cocci > > diff --git a/scripts/coccinelle/api/kzfree.cocci b/scripts/coccinelle/api/kzfree.cocci > new file mode 100644 > index 000000000000..c6b8f7676af4 > --- /dev/null > +++ b/scripts/coccinelle/api/kzfree.cocci > @@ -0,0 +1,53 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/// > +/// Use kzfree rather than memset with 0 followed by kfree > +/// > +// Confidence: High > +// Copyright: (C) 2020 Denis Efremov ISPRAS > +// Options: --no-includes --include-headers > +// > +// Keywords: kzfree > +// > + > +virtual context > +virtual org > +virtual report > +virtual patch > + > +// Ignore kzfree definition > +// Ignore kasan test > +@r depends on !patch && !(file in "lib/test_kasan.c") && !(file in "mm/slab_common.c")@ > +expression E; > +position p; > +@@ > + > +( > +* memset(E, 0, ...); > +| > +* memset(E, '\0', ...); > +) You shouldn't need both cases. 0 should be enough. Did you try ... here but find that some subexpressions of E could be modified in between? julia > +* kfree(E)@p; > + > +@r1 depends on patch && !(file in "lib/test_kasan.c") && !(file in "mm/slab_common.c")@ > +expression E; > +@@ > + > +( > +- memset(E, 0, ...); > +| > +- memset(E, '\0', ...); > +) > +- kfree(E); > ++ kzfree(E); > + > +@script:python depends on report@ > +p << r.p; > +@@ > + > +coccilib.report.print_report(p[0], "WARNING opportunity for kzfree") > + > +@script:python depends on org@ > +p << r.p; > +@@ > + > +coccilib.org.print_todo(p[0], "WARNING opportunity for kzfree") > -- > 2.26.2 > >