linux-kernel - Re: [PATCH v2 1/1] trusted-keys: match tpm_get

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Message-ID: <YJmf4Q0l+MTFEaEo@erythro.dev.benboeckel.internal>
Date:   Mon, 10 May 2021 17:04:33 -0400
From:   Ben Boeckel <me@...boeckel.net>
To:     keyrings@...r.kernel.org
Cc:     Ben Boeckel <mathstuf@...il.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v2 1/1] trusted-keys: match tpm_get_ops on all return
 paths

On Thu, Apr 29, 2021 at 15:21:56 -0400, Ben Boeckel wrote:
> From: Ben Boeckel <mathstuf@...il.com>
> 
> The `tpm_get_ops` call at the beginning of the function is not paired
> with a `tpm_put_ops` on this return path.
> 
> Fixes: f2219745250f ("security: keys: trusted: use ASN.1 TPM2 key format for the blobs")
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Ben Boeckel <mathstuf@...il.com>
> ---
>  security/keys/trusted-keys/trusted_tpm2.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
> index 617fabd4d913..0165da386289 100644
> --- a/security/keys/trusted-keys/trusted_tpm2.c
> +++ b/security/keys/trusted-keys/trusted_tpm2.c
> @@ -336,9 +336,9 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
>  			rc = -EPERM;
>  	}
>  	if (blob_len < 0)
> -		return blob_len;
> -
> -	payload->blob_len = blob_len;
> +		rc = blob_len;
> +	else
> +		payload->blob_len = blob_len;
>  
>  	tpm_put_ops(chip);
>  	return rc;

Ping? Is this going to make 5.13? This fixes an issue that is in
5.13-rc1.

--Ben