linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference in mem16_serial

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Message-ID: <20191212105754.GC1476206@kroah.com>
Date:   Thu, 12 Dec 2019 11:57:54 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     syzbot <syzbot+92f32d4e21fb246d31a2@...kaller.appspotmail.com>
Cc:     andriy.shevchenko@...ux.intel.com, asierra@...-inc.com,
        corbet@....net, ext-kimmo.rautkoski@...sala.com, jslaby@...e.com,
        kai.heng.feng@...onical.com, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, mika.westerberg@...ux.intel.com,
        paulburton@...nel.org, peter@...leysoftware.com, sr@...x.de,
        syzkaller-bugs@...glegroups.com, yamada.masahiro@...ionext.com,
        yegorslists@...glemail.com
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 mem16_serial_out

On Mon, Dec 09, 2019 at 05:38:01PM -0800, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit bd94c4077a0b2ecc35562c294f80f3659ecd8499
> Author: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Date:   Wed Oct 28 03:46:05 2015 +0000
> 
>     serial: support 16-bit register interface for console

That would be because that is when this function was added to the kernel
:)

Again, you are asking the kernel to write to a bad place in memory, and
then crash when that happens.  That sounds like the correct
functionality to me...

thanks,

greg k-h