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

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Message-ID: <YJsXN47MTF/TpsKX@kernel.org>
Date:   Wed, 12 May 2021 02:45:59 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Ben Boeckel <me@...boeckel.net>
Cc:     keyrings@...r.kernel.org, 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 Mon, May 10, 2021 at 05:04:33PM -0400, Ben Boeckel wrote:
> 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

I applied it, probably will do additional PR for v5.13 in order to fix
some urgent tpm_tis issues, so I'll include this to the same pull
request. Thanks for fixing this!

/Jarkko