netdev - Re: hso driver kernel NULL pointer dereference

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Message-ID: <YIZy96hlzl6Z/Gwv@hovoldconsulting.com>
Date:   Mon, 26 Apr 2021 09:59:51 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Leonardo Antoniazzi <leoanto@...ba.it>,
        Anirudh Rayabharam <mail@...rudhrb.com>,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: hso driver kernel NULL pointer dereference

On Mon, Apr 26, 2021 at 09:32:44AM +0200, Greg Kroah-Hartman wrote:
> On Sun, Apr 25, 2021 at 11:35:09PM +0200, Leonardo Antoniazzi wrote:
> > Hello,
> > removing my usb-modem (option icon 226) i get this oops (i attached the dmesg output):
> > 
> > BUG: kernel NULL pointer dereference, address: 0000000000000068
> > 
> > reverting this patch fix the problem on detaching the modem:
> > 
> > https://marc.info/?l=linux-usb&m=161781851805582&w=2
> > 
> > I'm not a developer, i hope the attached dmesg.txt will suffice
> 
> Ick, that's not good.
> 
> Anirudh, can you please look into this as it's caused by 8a12f8836145
> ("net: hso: fix null-ptr-deref during tty device unregistration") which
> is merged into 5.12.

I found the bug. Patch coming.

Johan