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 76ED2ECAAD2 for ; Mon, 29 Aug 2022 08:40:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229944AbiH2Iki (ORCPT ); Mon, 29 Aug 2022 04:40:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229447AbiH2Ikg (ORCPT ); Mon, 29 Aug 2022 04:40:36 -0400 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81BA32DA83 for ; Mon, 29 Aug 2022 01:40:35 -0700 (PDT) Received: by mail-io1-f69.google.com with SMTP id y1-20020a056602200100b006893cd97da9so4270919iod.1 for ; Mon, 29 Aug 2022 01:40:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc; bh=j7w9bf+ITDPc8TlQPw6wNiMpGqgHM+2YfN6ly1njXhc=; b=v7aoTKSQahp6CSL5mA5H4e1FzeoXw/qRBzCn8QnNUadx4WIBUiW7CZbY9kZyX1fN7/ YWh5QPTfrJFQgwJxNObzhun06xHSuFCMe7StkWG4lHn9JvZhSk+1Y1POWvOLcqNVF4uk v0xPHOh1LvPGDWzDaPW/DmpvP/yoEa7fyNZUW3PF3kELq+4LmuGu3TdX8GVkW8BwuR/+ Rbpp5IdMI0MMu0h8ZKotK7csE17e8qBqPiRgG9TLphJFsNrNceYN2BM/4L9FHNmhMHuw XPQjeIeoald+tkeA9ZEuSD98nT6eNWWuPI3cpRIFOG9OLLGmiHK1RJxcO42hNXc+FKj1 mbYg== X-Gm-Message-State: ACgBeo1K2WTtIAXVg3BpM5OY7nLYXF8zf0rTIhBpJDiaJ9qUvLesnZXM 92rA+YO3AEnoUyx9RIWUeSiCIpw6hs009BPfa/5IwAneEARS X-Google-Smtp-Source: AA6agR59760yqEfuZ+I+TqCLLuYMQlqSDMD9oJbXkrvlsfsX4t37njm3Rd6vZy603O5S6Vna8Y8WvBb3boZvJPVgEqvYDwaBs/qm MIME-Version: 1.0 X-Received: by 2002:a92:db04:0:b0:2e5:dbb6:1285 with SMTP id b4-20020a92db04000000b002e5dbb61285mr9522468iln.275.1661762434864; Mon, 29 Aug 2022 01:40:34 -0700 (PDT) Date: Mon, 29 Aug 2022 01:40:34 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a19c8005e75d37b3@google.com> Subject: Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in tty_ldisc_receive_buf From: syzbot To: Jiri Slaby Cc: 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 > #syz dup: BUG: unable to handle kernel NULL pointer dereference in can't find the dup bug > gsmld_receive_buf > > On 24. 08. 22, 18:35, syzbot wrote: >> 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 > > -- > js > suse labs >