From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from insect.birch.relay.mailchannels.net (insect.birch.relay.mailchannels.net [23.83.209.93]) by sourceware.org (Postfix) with ESMTPS id 795A13858C31 for ; Fri, 17 Feb 2023 13:38:59 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 795A13858C31 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=gotplt.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gotplt.org X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id C70B68C1A2E; Fri, 17 Feb 2023 13:38:57 +0000 (UTC) Received: from pdx1-sub0-mail-a305.dreamhost.com (unknown [127.0.0.6]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id 3F1568C1F8A; Fri, 17 Feb 2023 13:38:57 +0000 (UTC) ARC-Seal: i=1; s=arc-2022; d=mailchannels.net; t=1676641137; a=rsa-sha256; cv=none; b=bAV9vvxZW1drSncdZYUhm14PzRPWFO+z73komCgl7m+1abcJjlqDft4YbP8Yy2NtZ2bYb6 DtuJ2ya1wIC5OOTIS4eSL79AEQlUUKwoMCN/W1CnnD6odHL+lXNNsMaAzomiKldlXimFag Mv5KHrKaVqu6MehOYuxbdKKPr6m5goIAZ9FgmBMN+QDS8Z07A8KLjKal3pVT99KqO+fnK7 UtlKA8ZoydG9EhZyXkPnq+qv705geLC9NokmVi7a6ok2FtBCI7KzfyTF18dcdIEoe+nxaT iyraKXKDSA1l87coA+Mj/B2ZtAtVcmrcbCcLa9AQQl0EdoJv5zds3sSauRs7/A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=mailchannels.net; s=arc-2022; t=1676641137; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=SBOg9RMKH1JMXqXXfnhRTM7PJuIc0/YGccD1aM9Lvd4=; b=wVKiDIgcBPgx789Y6gBsbrTZaoNSdz8R36zRFxFltUmNkGrwDv0FHGdHzj6DwmTDVaxvNb LSiBrgLX03sdKaEJJmem5pYoOgHWWqMeISZpHaRYP7krTjxJgudOC3IA+XhXrSqjgylsbS XCMtX/yJQdVnKPKVF2JKjLebgGEXrKTo6tfrcJ3I+hKMK01vo9Df/ZRsfXWYCPdVnOo62r Pp6AMKE1fJCpMpWm1ul0AsC3HvsQoemovexw8FjZqKvrDjQaMvbhpv3+dJ7KCVZ7id68aw JR1jH8iBMz5dsexv5+MXTosDsF9825Elf4f1AOMEQ80cpTnVcK9Q+D7MqSJeBw== ARC-Authentication-Results: i=1; rspamd-759d9dd6cd-tx8lq; auth=pass smtp.auth=dreamhost smtp.mailfrom=siddhesh@gotplt.org X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Industry-Battle: 2ca8b6264857d9d3_1676641137614_944527634 X-MC-Loop-Signature: 1676641137614:1992099104 X-MC-Ingress-Time: 1676641137614 Received: from pdx1-sub0-mail-a305.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384) by 100.97.74.61 (trex/6.7.1); Fri, 17 Feb 2023 13:38:57 +0000 Received: from [192.168.0.182] (unknown [174.91.45.59]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a305.dreamhost.com (Postfix) with ESMTPSA id 4PJCZl70J6z1l; Fri, 17 Feb 2023 05:38:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gotplt.org; s=dreamhost; t=1676641137; bh=SBOg9RMKH1JMXqXXfnhRTM7PJuIc0/YGccD1aM9Lvd4=; h=Date:Subject:To:Cc:From:Content-Type:Content-Transfer-Encoding; b=gHtgN2aOGnbyJV8gFOQq9xE7bo4egSv/adgAp7hfw6LgXAL64vhPQTxFDEY4FcnC2 lF02EdksVMCgW1ccB9fF/9V0Jmis8qtOvE7cmH8dIKZC/4QBoH1Kxb8Tmym1dzxLqP K4Ib2M8BvyM4x13t+FX0JM7dFqU1B0ZpzRMHUYMzMsMxv/f8lBH0fkA1PJkHB9C9u2 xs8rkV+39EhqadmV+SaEIjCzYPVF6GRJl10UCH2qGyRztKJ8ut4UsNEjTqirQlHHMe gXzke5Xz01pTZqCl2KJ2CZaS+uMk8zgIw1DapHZIFwsXcCzeRyupD1q07C9/6DFPZu juaGpR/w0U5jg== Message-ID: Date: Fri, 17 Feb 2023 08:38:44 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: Missed warning (-Wuse-after-free) Content-Language: en-US To: Alejandro Colomar , GCC Cc: Iker Pedrosa , David Malcolm , Florian Weimer , Sam James , Paul Eggert , Michael Kerrisk , Martin Uecker , =?UTF-8?B?SuKCkeKCmeKCmyBHdXN0ZWR0?= , Yann Droneaud References: <8ed6d28c-69dc-fed8-5ab5-99f685f06fac@gmail.com> <38e7e994a81d2a18666404dbaeb556f3508a6bd6.camel@redhat.com> From: Siddhesh Poyarekar In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-3030.6 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 2023-02-17 06:22, Alejandro Colomar wrote: > Hi Siddhesh, > > On 2/17/23 04:48, Siddhesh Poyarekar wrote: >> On 2023-02-16 10:15, David Malcolm via Gcc wrote: >>> I'm not convinced that it's useful to the end-user to warn about the >>> "use of q itself" case. >> >> FWIW, -Wuse-after-free=3 already should do this: > > Thanks! It works. I would have expected such a warning to be included > in -Wextra. Does it have any false positives (or maybe too many false > negatives?) that make it unsuitable for -Wextra? I don't know why it isn't enabled in -Wextra, it seems like the right thing to do. Sid