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=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 0120DC433E0 for ; Mon, 11 Jan 2021 11:15:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BCC76224B1 for ; Mon, 11 Jan 2021 11:15:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729254AbhAKLPt (ORCPT ); Mon, 11 Jan 2021 06:15:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728251AbhAKLPs (ORCPT ); Mon, 11 Jan 2021 06:15:48 -0500 Received: from mail-qv1-xf2f.google.com (mail-qv1-xf2f.google.com [IPv6:2607:f8b0:4864:20::f2f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 23453C061795 for ; Mon, 11 Jan 2021 03:15:08 -0800 (PST) Received: by mail-qv1-xf2f.google.com with SMTP id s6so7232136qvn.6 for ; Mon, 11 Jan 2021 03:15:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=WhzjayrC+26z6DcD7za+9LxX5P6jZQRkbedPwq22Za4=; b=i7jIJuQOetY7AqcjiQ2frvUYvNHYwpeQYK3C5p9b9uM+p/thMZqFgpdxCGMvte2738 Ujpipxvxxi1ZE0+WY4hEtccyWsSc25MtmN4wwM82IebigfFhFlhaC5PNL8xp4pTzj1q+ 0JOGz8YVvozr0xNnMDdYMRHywb7a01OXhYM82g1QLjyzNMgBA9vObiptTJCPmG+b4cIV WS+D8XH/Ycg/ArKEi1vxvXPBPJCY8Ix4i0eJq4R8bDeBcqyA7XWyUeihJIii+cQ/grcI csFWME8nuY0Wp7iDBSFbG966WhqXchIKA0Rig/Tl22dD8N5o2675VXhwe6KlBr0cxXfq 6/SQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=WhzjayrC+26z6DcD7za+9LxX5P6jZQRkbedPwq22Za4=; b=ZOwCtxzTXqR6Ttf5V///OX+DYli2RKOalqpc7axO7yVGZmCWj0qQieQrZoWH1dnikD +WOgmqiSw38tVvgZ2I89oL5oYHNdddBMWeN32P/A5Ia71UsmBGxwAUlZhdM7/r5dHiAm V00gbtk3MyJbJdGa1KLfcXEKqYi5Rkckm6DmZxzCYdbVRFKHb9W2SR/KO/GZ/oC0uhFP aKhIkiVwWFFp+eRlnkKs6PUtbPUBb6Q1Epg//z9Ww5JDPrLQmPbLA5wRN/ulGXAsGljB 4O0hdTezRVaXRHMVCelA3tAwYxClPfqb7Z9uwIfonzJGb8P4Wkg7Ws9/3vIR6iY657AK tNEw== X-Gm-Message-State: AOAM533J3N9cUDIcaT9ayJCDPD5gDuhXy0bbwZRXFf2KDzV80SwkpxeL IGZnPVyxp4oVqQEFShSBajLNApFlrhQtUmNFVufPvg== X-Google-Smtp-Source: ABdhPJwaY/DZskeWJ/wgN51FKdecZhvZzj1LdP6oa+j7e6irK8NFeteAUbGt8m8Nm5D2XdcA72PzB3gj6cscE6+dvMQ= X-Received: by 2002:a0c:edab:: with SMTP id h11mr15064043qvr.23.1610363707075; Mon, 11 Jan 2021 03:15:07 -0800 (PST) MIME-Version: 1.0 References: <000000000000b0bbc905b05ab8d5@google.com> <000000000000b4098905b872801e@google.com> In-Reply-To: <000000000000b4098905b872801e@google.com> From: Dmitry Vyukov Date: Mon, 11 Jan 2021 12:14:56 +0100 Message-ID: Subject: Re: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow To: syzbot Cc: Jan Kara , linux-fsdevel , LKML , rkovhaev@gmail.com, syzkaller-bugs , Al Viro Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jan 9, 2021 at 8:20 AM syzbot wrote: > > syzbot suspects this issue was fixed by commit: > > commit d24396c5290ba8ab04ba505176874c4e04a2d53c > Author: Rustam Kovhaev > Date: Sun Nov 1 14:09:58 2020 +0000 > > reiserfs: add check for an invalid ih_entry_count > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=111480e7500000 > start commit: a68a0262 mm/madvise: remove racy mm ownership check > git tree: upstream > kernel config: https://syzkaller.appspot.com/x/.config?x=e597c2b53c984cd8 > dashboard link: https://syzkaller.appspot.com/bug?extid=3db80bbf66b88d68af9d > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1737b8a7500000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1697246b500000 > > If the result looks correct, please mark the issue as fixed by replying with: > > #syz fix: reiserfs: add check for an invalid ih_entry_count > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection Looks realistic. #syz fix: reiserfs: add check for an invalid ih_entry_count