linux-kernel - Re: KASAN: use-after-free Read in vc_do_resize; KASAN: use-after-free Read in screen_glyph

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Message-ID: <20200114083919.GB1113529@kroah.com>
Date:   Tue, 14 Jan 2020 09:39:19 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     wchenbt@....ust.hk
Cc:     linux-kernel@...r.kernel.org, syzkaller@...glegroups.com,
        jslaby@...e.com, nico@...xnic.net, textshell@...uujin.de
Subject: Re: KASAN: use-after-free Read in vc_do_resize; KASAN:
 use-after-free Read in screen_glyph_unicode;

On Tue, Jan 14, 2020 at 03:16:36PM +0800, wchenbt@....ust.hk wrote:
> Dear Linux kernel developers,
> 
> I found the crash "KASAN: use-after-free Read in vc_do_resize" and "KASAN:
> use-after-free Read in screen_glyph_unicode" when running syzkaller, hope
> its unknown:
> 
> Linux version: 1c163f4c7b3f Linux 5.0
> Branch: drivers/tty/vt/vt.c

"Branch" is a filename?

And 5.0 is almost a year old, please use a more modern kernel, like 5.4
at the very least.

And patches are the best way to fix syzbot issues, if you can still
reproduce this, sending a patch is the best way to get it fixed.

thanks,

greg k-h