linux-kernel - Aw: Re: [PATCH] tpm: fix potential NULL pointer access in tpm_del_char

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Date:   Mon, 13 Sep 2021 22:53:50 +0200
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     peterhuewe@....de, jgg@...pe.ca, p.rosenberger@...bus.com,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Aw: Re: [PATCH] tpm: fix potential NULL pointer access in
 tpm_del_char_device()


Hi,

> Gesendet: Montag, 13. September 2021 um 22:25 Uhr
> Von: "Jarkko Sakkinen" <jarkko@...nel.org>
> An: "Lino Sanfilippo" <LinoSanfilippo@....de>, peterhuewe@....de, jgg@...pe.ca
> Cc: p.rosenberger@...bus.com, linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
> Betreff: Re: [PATCH] tpm: fix potential NULL pointer access in tpm_del_char_device()
>
> On Fri, 2021-09-10 at 20:04 +0200, Lino Sanfilippo wrote:
> > In tpm_del_char_device() make sure that chip->ops is still valid.
> > This check is needed since in case of a system shutdown
> > tpm_class_shutdown() has already been called and set chip->ops to NULL.
> > This leads to a NULL pointer access as soon as tpm_del_char_device()
> > tries to access chip->ops in case of TPM 2.
> >
> > Fixes: dcbeab1946454 ("tpm: fix crash in tpm_tis deinitialization")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
> > ---
>
> Have you been able to reproduce this in some environment?
>
> /Jarkko
>
>

Yes, this bug is reproducable on my system that is running a 5.10 raspberry kernel.
I use a SLB 9670 which is connected via SPI.

Regards,
Lino