linux-kernel - Re: [PATCH v2] sc16is7xx: Prevent dereferencing invalid data when gpio

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Message-ID: <YcBsvFGF5DasixIy@kroah.com>
Date:   Mon, 20 Dec 2021 12:45:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Radim Pavlik <radim.pavlik@...-biometrics.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sc16is7xx: Prevent dereferencing invalid data when
 gpio_hog used

On Mon, Dec 20, 2021 at 12:36:03PM +0100, Radim Pavlik wrote:
> gpio_hog is trying to use gpio functions during probe call.
> At that time we dont have initialized port data which are dereferenced
> via assigned gpio.direction_input/output functions.
> This results in unable to handle kernel NULL pointer dereference
> followed by Kernel panic.
> This patch prevents that.
> 
> Due to changed order of initialization 'port' before 'gpio controller'
> was also changed error path which resulted in removed label.
> 
> No fixes tag because patch spans across multiple patches.

Then list the individual patches please.  Or at least give us a chance
to know how far back to backport this to stable kernels.

thanks,

greg k-h