linux-kernel - Re: [PATCH 1/1] tpm: fix error return code in tpm2_get_cc_attrs

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Date:   Sun, 9 May 2021 23:41:30 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] tpm: fix error return code in tpm2_get_cc_attrs_tbl()

On Sat, May 08, 2021 at 10:54:44AM +0800, Zhen Lei wrote:
> Fix to return a negative error code from the error handling
> case instead of 0, as done elsewhere in this function.
> 
> Fixes: 58472f5cd4f6("tpm: validate TPM 2.0 commands")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>

In the commit message:

1. Instead of writing "a negative error code", write -EFAULT.
2. Some explanation of the choice.

> ---
>  drivers/char/tpm/tpm2-cmd.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index eff1f12d981a..c84d23951219 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -656,6 +656,7 @@ int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
>  
>  	if (nr_commands !=
>  	    be32_to_cpup((__be32 *)&buf.data[TPM_HEADER_SIZE + 5])) {
> +		rc = -EFAULT;
>  		tpm_buf_destroy(&buf);
>  		goto out;
>  	}
> -- 
> 2.25.1
> 
> 
>

Other than that looks good.

/Jarkko