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From: Greg KH <gregkh@linuxfoundation.org>
To: syzbot <syzbot+92f32d4e21fb246d31a2@syzkaller.appspotmail.com>
Cc: andriy.shevchenko@linux.intel.com, asierra@xes-inc.com,
	corbet@lwn.net, ext-kimmo.rautkoski@vaisala.com, jslaby@suse.com,
	kai.heng.feng@canonical.com, linux-api@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-serial@vger.kernel.org, mika.westerberg@linux.intel.com,
	paulburton@kernel.org, peter@hurleysoftware.com, sr@denx.de,
	syzkaller-bugs@googlegroups.com, yamada.masahiro@socionext.com,
	yegorslists@googlemail.com
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in mem16_serial_out
Date: Thu, 12 Dec 2019 11:57:54 +0100	[thread overview]
Message-ID: <20191212105754.GC1476206@kroah.com> (raw)
In-Reply-To: <00000000000003cc8505994f9036@google.com>

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@socionext.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

  reply	other threads:[~2019-12-12 10:57 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09 19:35 BUG: unable to handle kernel NULL pointer dereference in mem16_serial_out syzbot
2019-12-10  1:38 ` syzbot
2019-12-12 10:57   ` Greg KH [this message]
2019-12-13  9:05     ` Dmitry Vyukov
2021-04-26 16:14 ` [PATCH] serial: 8250: fix NULL pointer dereference in serial8250_do_startup() Vegard Nossum
2021-04-26 16:17   ` Greg Kroah-Hartman
2021-04-26 16:33     ` Vegard Nossum
2021-04-28  6:36       ` BUG: unable to handle kernel NULL pointer dereference in mem16_serial_out syzbot
2021-05-13 14:24       ` [PATCH] serial: 8250: fix NULL pointer dereference in serial8250_do_startup() Greg Kroah-Hartman

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