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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98026C433F5 for ; Thu, 31 Mar 2022 14:30:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237573AbiCaOcg (ORCPT ); Thu, 31 Mar 2022 10:32:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237562AbiCaOcd (ORCPT ); Thu, 31 Mar 2022 10:32:33 -0400 Received: from mail-il1-x12d.google.com (mail-il1-x12d.google.com [IPv6:2607:f8b0:4864:20::12d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4392B1D67D9 for ; Thu, 31 Mar 2022 07:30:46 -0700 (PDT) Received: by mail-il1-x12d.google.com with SMTP id x9so16858116ilc.3 for ; Thu, 31 Mar 2022 07:30:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=from:to:cc:in-reply-to:references:subject:message-id:date :mime-version:content-transfer-encoding; bh=l8CekeoQZXHX4U3TiS2vpp4O2YuTCmdU/BDSBQosw7Q=; b=2t3SM0cZXUR72lsXD7aWv01f4VUP1+TsCWH1VXhR9gW8eeqvvAYm8IPed6tPPC/+bT /wf9r2P3V48ygYra/UM1VT50ENC51HGaz5CRa65IhBEmNu5LJEGBB7CqL0dNZJ++bP5l ZuFHQmFFFJgh/P90XI1k0WCdnaV/65iQKBTWubWDoonZK3zxaSLZQXZus5lAGOBhywkZ TrV5h5uml6+9t1iFBJ5FnSDBddgz0muYcbWXUBl6LXRAAfpdksB4eK30BIE/mJJM1ZHC rmY/8/X0BmT2ei/CA6CADJPhXxCAdFQCskc1lcm8c4RtAGPxzECZY8oM8CNOmAkuRemv /OtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:in-reply-to:references:subject :message-id:date:mime-version:content-transfer-encoding; bh=l8CekeoQZXHX4U3TiS2vpp4O2YuTCmdU/BDSBQosw7Q=; b=IWWZfV1vqBuOCnIZrdPcyHoq2vYKCYt7eOegnDD8Ycn3WG9WIAqKS/8O4kOh8gQUt/ 1CK9qFdVPOfN57ZLWilYSmOw1ldvV+Bjz+TPD/QE6cElBVqMYVmd4ZfnqHCpoc2nTuC9 PGi0LWcGktWrXpqazRPV+aU26HG4Zpqwpn26/8HC6sEL3+YTqEXzwbjAvCpI2uGfC54P neOqNcrcQTiwOoIc9xr57AFgLF68iDd5ejpRfApcELZAl49IqJYV+47aUV1YLyZ+sAcG DOUR6dtwPt3w/n5AykMzOr69mCPmcxQNk44y4LUmKnOLMArdMBIFq9if3O2YCV7zwdK2 EjMg== X-Gm-Message-State: AOAM533yBI5Gx0SjZ9hPXoqaTaoA1Txhme5Qyq3zhUW9IghGOdkez0VM fdspjOtdoAud4USS8lz/lCH/AQ== X-Google-Smtp-Source: ABdhPJz25adczaNwDR175aQhqMn4WdHp4yEMllsYZBu8VTCksFw0OQj+38m10GkF9u9YGSPT+0qfJg== X-Received: by 2002:a05:6e02:1c0a:b0:2c7:75de:d84 with SMTP id l10-20020a056e021c0a00b002c775de0d84mr13381733ilh.186.1648737045567; Thu, 31 Mar 2022 07:30:45 -0700 (PDT) Received: from [127.0.1.1] ([207.135.234.126]) by smtp.gmail.com with ESMTPSA id i3-20020a056602134300b0064620a85b6dsm13883109iov.12.2022.03.31.07.30.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Mar 2022 07:30:44 -0700 (PDT) From: Jens Axboe To: josef@toxicpanda.com, Zhang Wensheng Cc: linux-block@vger.kernel.org, nbd@other.debian.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com In-Reply-To: <20220310093224.4002895-1-zhangwensheng5@huawei.com> References: <20220310093224.4002895-1-zhangwensheng5@huawei.com> Subject: Re: [PATCH -next] nbd: fix possible overflow on 'first_minor' in nbd_dev_add() Message-Id: <164873704446.46490.778795283218997371.b4-ty@kernel.dk> Date: Thu, 31 Mar 2022 08:30:44 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 10 Mar 2022 17:32:24 +0800, Zhang Wensheng wrote: > When 'index' is a big numbers, it may become negative which forced > to 'int'. then 'index << part_shift' might overflow to a positive > value that is not greater than '0xfffff', then sysfs might complains > about duplicate creation. Because of this, move the 'index' judgment > to the front will fix it and be better. > > > [...] Applied, thanks! [1/1] nbd: fix possible overflow on 'first_minor' in nbd_dev_add() commit: 6d35d04a9e18990040e87d2bbf72689252669d54 Best regards, -- Jens Axboe