netdev - Re: [PATCH 6/8] scm: Capture the full credentials of the scm sender.

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Message-ID: <m1r5k8bozu.fsf@fess.ebiederm.org>
Date:	Tue, 15 Jun 2010 02:53:57 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	David Miller <davem@...emloft.net>,
	Serge Hallyn <serue@...ibm.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Daniel Lezcano <daniel.lezcano@...e.fr>, netdev@...r.kernel.org
Subject: Re: [PATCH 6/8] scm: Capture the full credentials of the scm sender.

Pavel Emelyanov <xemul@...nvz.org> writes:

>> +static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
>> +{
>> +	put_pid(scm->pid);
>> +	scm->pid  = NULL;
>> +
>> +	if (scm->cred)
>> +		put_cred(scm->cred);
>> +	scm->cred = NULL;
>> +}
>> +
>>  static __inline__ void scm_destroy(struct scm_cookie *scm)
>>  {
>> +	scm_destroy_cred(scm);
>>  	if (scm && scm->fp)
>>  		__scm_destroy(scm);
>>  }
>
> I'm a bit worried by the "if (scm" check. It makes me think scm can
> be NULL here and thus scm_destroy_cred can oops.

Interesting point.  I just looked at all of the callers and scm
appears to always be valid.

Eric

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