linux-kernel - Re: [PATCH 2/2] keys, trusted: seal with a policy

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Message-ID: <alpine.LRH.2.20.1511201332240.21323@namei.org>
Date:	Fri, 20 Nov 2015 13:34:35 +1100 (AEDT)
From:	James Morris <jmorris@...ei.org>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
cc:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	David Howells <dhowells@...hat.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Jonathan Corbet <corbet@....net>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"open list:KEYS-ENCRYPTED" <linux-security-module@...r.kernel.org>,
	"open list:KEYS-ENCRYPTED" <keyrings@...r.kernel.org>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"moderated list:TPM DEVICE DRIVER" 
	<tpmdd-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 2/2] keys, trusted: seal with a policy

On Wed, 18 Nov 2015, Jarkko Sakkinen wrote:

> On Wed, Nov 18, 2015 at 11:21:01AM +1100, James Morris wrote:
> > On Tue, 17 Nov 2015, Jarkko Sakkinen wrote:
> > 
> > >  			}
> > >  			break;
> > > +		case Opt_policydigest:
> > > +			if (!tpm2 ||
> > > +			    strlen(args[0].from) != (2 * opt->digest_len))
> > > +				return -EINVAL;
> > > +			kfree(opt->policydigest);
> > > +			opt->policydigest = kzalloc(opt->digest_len,
> > > +						    GFP_KERNEL);
> > 
> > Is it correct to kfree opt->policydigest here before allocating it?
> 
> I think so. The same option might be encountered multiple times.

This would surely signify an error?


-- 
James Morris
<jmorris@...ei.org>

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