linux-kernel - Re: [PATCH v3 02/16] tpm: fix invalid return value in pubek

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Date:   Mon, 5 Nov 2018 16:51:04 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-integrity@...r.kernel.org
Cc:     linux-security-module@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 02/16] tpm: fix invalid return value in pubek_show()

On 11/4/18 8:45 PM, Jarkko Sakkinen wrote:
> Return zero when tpm_buf_init() fails as we do for other functions in
> tpm-sysfs.c.
>
> Fixes: da379f3c1db0c ("tpm: migrate pubek_show to struct tpm_buf")
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>


> ---
>   drivers/char/tpm/tpm-sysfs.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
> index c2769e55cb6c..7ed7eb6f906a 100644
> --- a/drivers/char/tpm/tpm-sysfs.c
> +++ b/drivers/char/tpm/tpm-sysfs.c
> @@ -47,9 +47,8 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
>
>   	memset(&anti_replay, 0, sizeof(anti_replay));
>
> -	rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
> -	if (rc)
> -		return rc;
> +	if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
> +		return 0;
>
>   	tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
>