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=-7.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 5BABEC4727E for ; Fri, 25 Sep 2020 23:17:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1910520829 for ; Fri, 25 Sep 2020 23:17:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601075837; bh=EbJfwvBeHXIYBXTTELse8un9TJ2c/bhePB4Xfufh4yI=; h=Subject:To:References:Cc:From:Date:In-Reply-To:List-ID:From; b=Ru9pe1sj14ZAvab/yuQZokA3xo3HgEozcCkVT7QtnZl3srIf7RBNb2YT5DIRf8NIi 2T9KWfWO5PIE/rQCJYWGyapS8rzADcbtZlBEjjNSSbs3iUEhctS7YsG+zOMyGUO0Sg xnfrSCq+ySunoTaXMf3jQlUTPC+UdmxX+6+WbNMw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729323AbgIYXRP (ORCPT ); Fri, 25 Sep 2020 19:17:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:39056 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726348AbgIYXRP (ORCPT ); Fri, 25 Sep 2020 19:17:15 -0400 Received: from [192.168.0.108] (unknown [49.65.245.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 71D042074B; Fri, 25 Sep 2020 23:17:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601075834; bh=EbJfwvBeHXIYBXTTELse8un9TJ2c/bhePB4Xfufh4yI=; h=Subject:To:References:Cc:From:Date:In-Reply-To:From; b=sGBG9THcIeHUpPQzlCVRHKRzBldFa0OoegE5xBKJJDE09XngNv7EhKTWvzGyqXUJP SReJNDgIo2CBwnM1FFUKm9UpgaEZW/roKBqoHjNFHaB2AdddeTjFF6VPx0IbP0AgfT Trqfe2ACwHH/Wd3NfuSZIbJVEjuvWVL4XUac/Ki8= Subject: Re: [f2fs-dev] KMSAN: uninit-value in f2fs_lookup To: Eric Biggers , Chao Yu References: <000000000000f9f80905b01c7185@google.com> <20200925163819.GA3315208@gmail.com> <20200925164538.GB3315208@gmail.com> Cc: syzbot , glider@google.com, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com From: Chao Yu Message-ID: <36d3ddc1-e8d1-6d0e-c1ea-aff198740182@kernel.org> Date: Sat, 26 Sep 2020 07:17:09 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20200925164538.GB3315208@gmail.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-9-26 0:45, Eric Biggers wrote: > On Fri, Sep 25, 2020 at 09:38:19AM -0700, Eric Biggers wrote: >> On Fri, Sep 25, 2020 at 05:06:33PM +0800, Chao Yu wrote: >>> Hi, >>> >>> I don't see any problem here, thanks for your report. :) >>> >>> Thanks, >> >> What about if max_depth == 0 in __f2fs_find_entry()? Then __f2fs_find_entry() >> would return NULL without initializing *res_page. > > ... and I now see Dan Carpenter already pointed this out. I was a bit late! Thanks for your check as well. :) Thanks, > > - Eric >