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=-8.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, 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 2C7F3C433DF for ; Wed, 14 Oct 2020 20:44:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC3B82224E for ; Wed, 14 Oct 2020 20:44:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=toxicpanda-com.20150623.gappssmtp.com header.i=@toxicpanda-com.20150623.gappssmtp.com header.b="Vbg+qHnO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387696AbgJNUoq (ORCPT ); Wed, 14 Oct 2020 16:44:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33672 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387427AbgJNUoq (ORCPT ); Wed, 14 Oct 2020 16:44:46 -0400 Received: from mail-io1-xd42.google.com (mail-io1-xd42.google.com [IPv6:2607:f8b0:4864:20::d42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 03321C0613D2 for ; Wed, 14 Oct 2020 13:44:46 -0700 (PDT) Received: by mail-io1-xd42.google.com with SMTP id 67so940152iob.8 for ; Wed, 14 Oct 2020 13:44:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=+aY6Y4Fu8fkz6dEU/rqw5o2tWjXkkN7Ep0a4N3FYHb4=; b=Vbg+qHnOIF2O9u2gHF7Z2jJKsze2YxqDW+k8g2/285OXjW3tPIzHz9Qv/yJe+gX4AD Kfs3kQZiG8OnrD3Us304Rz5xtKlGb8wboCd3nxdCyFqy8Kg0WY9p5/yx+ywWk0Ga5yA2 CRU2hFTKUdeT645O+MVwKDZgybqeOTMmZM5ABWTqynqhmmmQ12vIqLa6KfsVvvymhOTW xGCYdVoQZzxhQZcrgT4mmNav9r1AbDROu4I4FV+pJanva7j3WllUz8V6hhLWjN338/pe t8H+7qO6EB7Br5ngeqrbTt3SSFbJcVBi18+CVLRF92alDXvL/RP/sZLp43ICxPz10eWh DxTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=+aY6Y4Fu8fkz6dEU/rqw5o2tWjXkkN7Ep0a4N3FYHb4=; b=cWHrpMY9rxH41NS1n0L/VD3+1yqBalXPGS7XBEVDPlr4NPTckHe2G59gm3sn3MpmJt c36oohinWJ6EOzDbJvD1rvq9qIRAqyIQY17H9ZcI2neAj+kfPbaDgyrMbUOUHchOJ9V3 /rwCtU5X05uFcGUxPniWKw2+xj/UQJBlxgpUi67lgAq7r4h4COVTEfOk4iyQ0/vGi5vU fiBVs7hJVkYtvK7YMvWILZvOGlSzW4ZGn/lEe7uII1iWcR8Gm9RMdTM/pi02GxbGU/Ku EorGQigoXQ+9Y9JPL/DxdMpf09QmZhVHJVsjB9pxqYAE7t9csok1G064NPnKwTfiWUk1 lVWQ== X-Gm-Message-State: AOAM533IvEbjsCZ4SuCw/b4W9IoVRERc9T5dbnWUVykVlt9b9f9txHj1 ESQVKOT0cP22in54hL0MohKHi7YNOSwiBQ== X-Google-Smtp-Source: ABdhPJwXEbaazPV9jgorXUIQ6mQM9WwU9feG5FerYtnklEsefZwqnWmW7AAAFOrOPLgnsZ22PhhdxA== X-Received: by 2002:a05:6602:2ac9:: with SMTP id m9mr990676iov.20.1602708285293; Wed, 14 Oct 2020 13:44:45 -0700 (PDT) Received: from ?IPv6:2620:10d:c0a8:11d1::1116? ([2620:10d:c091:480::1:6b7a]) by smtp.gmail.com with ESMTPSA id e11sm569574ilp.7.2020.10.14.13.44.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Oct 2020 13:44:44 -0700 (PDT) Subject: Re: [PATCH v2] btrfs: Fix divide by zero To: Daniel Xu , linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com, quwenruo.btrfs@gmx.com, Qu Wenruo References: <20201009010910.270794-1-dxu@dxuuu.xyz> From: Josef Bacik Message-ID: <59853d19-2ead-9ac9-33ea-06f88218374d@toxicpanda.com> Date: Wed, 14 Oct 2020 16:44:42 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.3.2 MIME-Version: 1.0 In-Reply-To: <20201009010910.270794-1-dxu@dxuuu.xyz> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 10/8/20 9:09 PM, Daniel Xu wrote: > If there's no parity and num_stripes < ncopies, an btrfs image can > trigger a divide by zero in calc_stripe_length(). > > The image (see link) was generated through fuzzing. > > Reviewed-by: Qu Wenruo > Link: https://bugzilla.kernel.org/show_bug.cgi?id=209587 > Signed-off-by: Daniel Xu > Reviewed-by: Josef Bacik Thanks, Josef