linux-kernel - Re: [PATCH] avc: remove unnecessary pointer reassignment

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Message-ID: <54F06DF1.8070605@tycho.nsa.gov>
Date:	Fri, 27 Feb 2015 08:15:29 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Jeff Vander Stoep <jeffv@...gle.com>, jvanderstoep@...il.com
CC:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	James Morris <james.l.morris@...cle.com>,
	selinux@...ho.nsa.gov, Paul Moore <paul@...l-moore.com>,
	Eric Paris <eparis@...isplace.org>
Subject: Re: [PATCH] avc: remove unnecessary pointer reassignment

On 02/26/2015 04:54 PM, Jeff Vander Stoep wrote:
> Commit f01e1af445fa ("selinux: don't pass in NULL avd to avc_has_perm_noaudit")
> made this pointer reassignment unnecessary. Avd should continue to reference
> the stack-based copy.
> 
> Signed-off-by: Jeff Vander Stoep <jeffv@...gle.com>

Acked-by:  Stephen Smalley <sds@...ho.nsa.gov>

> ---
>  security/selinux/avc.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/security/selinux/avc.c b/security/selinux/avc.c
> index afcc0ae..3c17dda 100644
> --- a/security/selinux/avc.c
> +++ b/security/selinux/avc.c
> @@ -724,12 +724,10 @@ inline int avc_has_perm_noaudit(u32 ssid, u32 tsid,
>  	rcu_read_lock();
>  
>  	node = avc_lookup(ssid, tsid, tclass);
> -	if (unlikely(!node)) {
> +	if (unlikely(!node))
>  		node = avc_compute_av(ssid, tsid, tclass, avd);
> -	} else {
> +	else
>  		memcpy(avd, &node->ae.avd, sizeof(*avd));
> -		avd = &node->ae.avd;
> -	}
>  
>  	denied = requested & ~(avd->allowed);
>  	if (unlikely(denied))
> 

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