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 26627C00140 for ; Wed, 24 Aug 2022 16:35:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239113AbiHXQfi (ORCPT ); Wed, 24 Aug 2022 12:35:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238384AbiHXQfc (ORCPT ); Wed, 24 Aug 2022 12:35:32 -0400 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 291BC80F4C for ; Wed, 24 Aug 2022 09:35:31 -0700 (PDT) Received: by mail-il1-f199.google.com with SMTP id d6-20020a056e020be600b002dcc7977592so12922914ilu.17 for ; Wed, 24 Aug 2022 09:35:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc; bh=SAh57rTjphZIWff57ut959PhYNidmDvkR6EstUizDYg=; b=QKLZbtgUA8tHyu4sTVX1Go7z9a1kVE9VEoKUFZNnRhAtUu+9gV1T7QcPatBsfglsYD 4KIP1RscyXAFMowZ0B0mLJfoXRYcVBwnOw3q9d7Kkm3q3Zt0qb2+ie5t/5BNjtLZ7rMT eMzU9vRCSmZfJEvxwI10VHP5xRWrBEYZX4VIjh73YhlFB8eH/b+41osdzP1rKt3cwkQV nNiwZ1fq0TqGr3lhkH0ypP09ucfKeZRHopT8AgK8Jmq5Oh5nHfBy4J5/Sxl4MthCKHSr ub8bX9/X6Nv1M/nO84qcJrC+cNuet3B589w+1j3vHTkdyIQdWxkZjtoNRldTabpttBeQ cJVQ== X-Gm-Message-State: ACgBeo1pEJ/4cPW8WqtYWxCCcivcf32xNmuqsQTK0WFIhAnzKMLT9Ju+ sj14xDBdG4gDl6Aqf315xaoPU7iYePKIq0mM+O/24NJ1VXxY X-Google-Smtp-Source: AA6agR6ZBN+WFXvWU4gkmCBNPwWt+c3aM7f4qneAfNHwmFoJDz3AphkWJNHmAzr5AZ7WMJX524bl6IM1YG4a3ZVE27us75gCT8Rx MIME-Version: 1.0 X-Received: by 2002:a05:6638:160a:b0:349:d991:d929 with SMTP id x10-20020a056638160a00b00349d991d929mr8183409jas.144.1661358930466; Wed, 24 Aug 2022 09:35:30 -0700 (PDT) Date: Wed, 24 Aug 2022 09:35:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e51e3e05e6ff44db@google.com> Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in tty_ldisc_receive_buf From: syzbot To: gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 1c23f9e627a7 Linux 6.0-rc2 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=177ac367080000 kernel config: https://syzkaller.appspot.com/x/.config?x=3045c937aad027f7 dashboard link: https://syzkaller.appspot.com/bug?extid=be4b95faeb7a9073bb88 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1701758d080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17473aad080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+be4b95faeb7a9073bb88@syzkaller.appspotmail.com Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000006 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault user pgtable: 4k pages, 48-bit VAs, pgdp=000000010b44f000 [0000000000000000] pgd=080000010b5f3003, p4d=080000010b5f3003, pud=080000010b1ce003, pmd=0000000000000000 Internal error: Oops: 86000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 28 Comm: kworker/u4:1 Not tainted 6.0.0-rc2-syzkaller-16440-g1c23f9e627a7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/20/2022 Workqueue: events_unbound flush_to_ldisc pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : gsmld_receive_buf+0x140/0x214 drivers/tty/n_gsm.c:2861 sp : ffff80000f603c30 x29: ffff80000f603c40 x28: 0000000000000000 x27: 00000000000003d9 x26: 0000000000000000 x25: 0000000000000000 x24: ffff80000d937000 x23: ffff80000d681e40 x22: ffff0000c929b800 x21: 0000000000000000 x20: ffff80000c205988 x19: ffff0000c91cf446 x18: ffff80000d2dec40 x17: 0000000000000008 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000004 x12: ffff80000d681e78 x11: ff808000098e7e04 x10: 0000000000000000 x9 : ffff8000098e7e04 x8 : 0000000000000000 x7 : ffff8000098dac3c x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 00000000000003da x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c929b800 Call trace: 0x0 tty_ldisc_receive_buf+0xb8/0xcc drivers/tty/tty_buffer.c:461 tty_port_default_receive_buf+0x54/0x8c drivers/tty/tty_port.c:39 receive_buf drivers/tty/tty_buffer.c:511 [inline] flush_to_ldisc+0x150/0x358 drivers/tty/tty_buffer.c:561 process_one_work+0x2d8/0x504 kernel/workqueue.c:2289 worker_thread+0x340/0x610 kernel/workqueue.c:2436 kthread+0x12c/0x158 kernel/kthread.c:376 ret_from_fork+0x10/0x20 Code: bad PC value ---[ end trace 0000000000000000 ]--- --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches