linux-kernel - Re: [PATCH] tpm: check for TPM_CHIP_FLAG_TPM2 before calling tpm2

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Message-ID: <20160425175720.GB7675@obsidianresearch.com>
Date:	Mon, 25 Apr 2016 11:57:20 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	Peter Huewe <peterhuewe@....de>,
	linux-security-module@...r.kernel.org,
	Stefan Berger <stefanb@...ux.vnet.ibm.com>,
	Marcel Selhorst <tpmdd@...horst.net>,
	"moderated list:TPM DEVICE DRIVER" 
	<tpmdd-devel@...ts.sourceforge.net>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: check for TPM_CHIP_FLAG_TPM2 before calling
 tpm2_shutdown()

On Mon, Apr 25, 2016 at 12:21:30PM +0300, Jarkko Sakkinen wrote:
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> Reported-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
>  drivers/char/tpm/tpm-chip.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-By: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Fixes: 20e0152393b41 ("tpm: fix crash in tpm_tis deinitialization")

> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index a12db8e..1965dc7 100644
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -270,7 +270,8 @@ static void tpm_del_char_device(struct tpm_chip *chip)
>  
>  	/* Make the driver uncallable. */
>  	down_write(&chip->ops_sem);
> -	tpm2_shutdown(chip, TPM2_SU_CLEAR);
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +		tpm2_shutdown(chip, TPM2_SU_CLEAR);
>  	chip->ops = NULL;
>  	up_write(&chip->ops_sem);
>  }