linux-kernel - Re: [PATCH] tpm: Ensure that tpm chip has ops to check if it's defective

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Date:   Fri, 23 Jun 2023 08:08:35 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linux regressions mailing list <regressions@...ts.linux.dev>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Sachin Sant <sachinp@...ux.ibm.com>
Subject: Re: [PATCH] tpm: Ensure that tpm chip has ops to check if it's
 defective

On Thu, Jun 22, 2023 at 10:04:27PM -0500, Mario Limonciello wrote:
> The ibmvtpm doesn't have `chip->ops` set, and so trying to check
> if it's a defective AMD fTPM doesn't work.
> 
> Add an extra check to tpm_amd_is_rng_defective() to ensure the
> TPM being checked has `chip->ops`.
> 
> Cc: Linux regressions mailing list <regressions@...ts.linux.dev>
> Reported-by: Aneesh Kumar K. V <aneesh.kumar@...ux.ibm.com>
> Reported-by: Sachin Sant <sachinp@...ux.ibm.com>
> Link: https://lore.kernel.org/lkml/99B81401-DB46-49B9-B321-CF832B50CAC3@linux.ibm.com/
> Tested-by: Sachin Sant <sachinp@...ux.ibm.com>
> Fixes: bd8621ca1510 ("tpm: Add !tpm_amd_is_rng_defective() to the hwrng_unregister() call site")
> Fixes: f1324bbc4011 ("tpm: disable hwrng for fTPM on some AMD designs")
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>  drivers/char/tpm/tpm-chip.c | 3 +++
>  1 file changed, 3 insertions(+)

No cc: stable on that list above?

greg k-h