netdev - Re: hso driver kernel NULL pointer dereference

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Date:   Mon, 26 Apr 2021 09:32:44 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Leonardo Antoniazzi <leoanto@...ba.it>,
        Anirudh Rayabharam <mail@...rudhrb.com>
Cc:     linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: hso driver kernel NULL pointer dereference

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.

thanks,

greg k-h