linux-kernel - Re: [PATCH v5 09/17] tpm: move tpm_validate

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Date:   Fri, 9 Nov 2018 01:07:49 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>
Cc:     "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        "Struk, Tadeusz" <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 v5 09/17] tpm: move tpm_validate_commmand() to
 tpm2-space.c

On Thu, Nov 08, 2018 at 05:03:29PM +0000, Winkler, Tomas wrote:
> You initialized cc under if only 
> > +
> > +		i = tpm2_find_cc(chip, cc);
> > +		if (i < 0) {
> > +			dev_dbg(&chip->dev, "0x%04X is an invalid
> > command\n",
> > +				cc);
> > +			return -EOPNOTSUPP;
> > +		}
> > +
> > +		attrs = chip->cc_attrs_tbl[i];
> > +		nr_handles =
> > +			4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) &
> > GENMASK(2, 0));
> > +		if (len < TPM_HEADER_SIZE + 4 * nr_handles)
> > +			goto err_len;
> > +	}
> > +
> > +	return cc;
> You can return uninitialized cc here.

Thanks, good catch.

/Jarkko