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 0A74CC77B73 for ; Mon, 1 May 2023 14:33:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232513AbjEAOdD (ORCPT ); Mon, 1 May 2023 10:33:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232435AbjEAOdC (ORCPT ); Mon, 1 May 2023 10:33:02 -0400 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9A051A4 for ; Mon, 1 May 2023 07:32:59 -0700 (PDT) Received: by mail-il1-f208.google.com with SMTP id e9e14a558f8ab-3294f07346aso15086875ab.0 for ; Mon, 01 May 2023 07:32:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682951579; x=1685543579; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=P/+2cE3z0lhFjJbQiqH+I4CrwDRwNUiZcC7hmNJYW8A=; b=E6ii+RILgx+cCqJYIEqESc3odSTwOEng/vc2beCtqPSmhMRCZ7mlPvCuWxXnqJq3/A XyCDb/GYKc0ayAfwDje00CxyK5tMRPDvRl8JC4R5IvE+7nHOqprTvUECBFHe+sgQorcA 9NA5u0ARG0scBWCCzsG7SuihcUIdi6R5nXr0U/C+SFuKy9idbfIt395PCNk9Sxhr7MHJ xD4azffyDR2tcTYi1pA6THULwvYvneuQgGUHa0PdYUB7hEH7VLbUXU8h3lV2mEhDesWZ B1/tB6k+CTl3iV2L/K42BTjSN1vLvP4tT/xKfJ7VYEgEW1chtIBD4Nu1r6D7GgkXNCd8 LzmQ== X-Gm-Message-State: AC+VfDyBiSvJSACl79ywdQUvTMhsugBCEhHkYGGr39ztgZf6YpAW0U6z fqcpK34M5P50JMI16jvXlnqTrYxDsgip0kPj676qrI2v64jUguv1oA== X-Google-Smtp-Source: ACHHUZ7DsuxZyoa81uiXdIozGw32ivqgikl7MTNF7YLxBS3TNpQmsmoQ2mMfQ+ius/6AArevc1fkfTOzPrHeH348q+hxz4yeZBE1 MIME-Version: 1.0 X-Received: by 2002:a92:c90e:0:b0:32b:1c9f:3c48 with SMTP id t14-20020a92c90e000000b0032b1c9f3c48mr7029883ilp.1.1682951579100; Mon, 01 May 2023 07:32:59 -0700 (PDT) Date: Mon, 01 May 2023 07:32:59 -0700 In-Reply-To: <0000000000007fcc9c05f909f7f3@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000bf02a05faa2b3d2@google.com> Subject: Re: [syzbot] [reiserfs?] KASAN: null-ptr-deref Read in fix_nodes From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, reiserfs-devel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: 58390c8ce1bd Merge tag 'iommu-updates-v6.4' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=155bead8280000 kernel config: https://syzkaller.appspot.com/x/.config?x=d56ffc213bf6bf4a dashboard link: https://syzkaller.appspot.com/bug?extid=5184326923f180b9d11a compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16936ffc280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/64e93dba0330/disk-58390c8c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2b7f3c1154f1/vmlinux-58390c8c.xz kernel image: https://storage.googleapis.com/syzbot-assets/4ad00371a063/bzImage-58390c8c.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/5bd5f6fead6e/mount_1.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/58251a87486a/mount_10.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5184326923f180b9d11a@syzkaller.appspotmail.com REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 4029, free_space(entry_count) 2 REISERFS error (device loop2): vs-5150 search_by_key: invalid format found in block 539. Fsck? ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: null-ptr-deref in buffer_locked include/linux/buffer_head.h:126 [inline] BUG: KASAN: null-ptr-deref in fix_nodes+0x464/0x8660 fs/reiserfs/fix_node.c:2578 Read of size 8 at addr 0000000000000000 by task syz-executor.2/5390 CPU: 1 PID: 5390 Comm: syz-executor.2 Not tainted 6.3.0-syzkaller-12049-g58390c8ce1bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_report mm/kasan/report.c:465 [inline] kasan_report+0xec/0x130 mm/kasan/report.c:572 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:187 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] buffer_locked include/linux/buffer_head.h:126 [inline] fix_nodes+0x464/0x8660 fs/reiserfs/fix_node.c:2578 reiserfs_cut_from_item+0x2bd/0x1b20 fs/reiserfs/stree.c:1740 reiserfs_do_truncate+0x630/0x1080 fs/reiserfs/stree.c:1971 reiserfs_truncate_file+0x1b5/0x1070 fs/reiserfs/inode.c:2308 reiserfs_setattr+0xddf/0x1370 fs/reiserfs/inode.c:3393 notify_change+0xb2c/0x1180 fs/attr.c:483 do_truncate+0x143/0x200 fs/open.c:66 handle_truncate fs/namei.c:3295 [inline] do_open fs/namei.c:3640 [inline] path_openat+0x2083/0x2750 fs/namei.c:3791 do_filp_open+0x1ba/0x410 fs/namei.c:3818 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x11d/0x1c0 fs/open.c:1376 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4ee868c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4ee9456168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f4ee87ac120 RCX: 00007f4ee868c169 RDX: 0000000000000000 RSI: 000000000014937e RDI: 0000000020000180 RBP: 00007f4ee86e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe3e91162f R14: 00007f4ee9456300 R15: 0000000000022000 ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.