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

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Message-ID: <CAFJ0LnHbmx+oyAfLJvigebA3rHxtLhdROq=u2FQ+eFHG7t5+wA@mail.gmail.com>
Date:	Thu, 26 Feb 2015 14:08:31 -0800
From:	Nick Kralevich <nnk@...gle.com>
To:	Jeff Vander Stoep <jeffv@...gle.com>
Cc:	Jeffrey Vander Stoep <jvanderstoep@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	James Morris <james.l.morris@...cle.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	SELinux <selinux@...ho.nsa.gov>
Subject: Re: [PATCH] avc: remove unnecessary pointer reassignment

Acked-By: Nick Kralevich <nnk@...gle.com>

On Thu, Feb 26, 2015 at 1:54 PM, Jeff Vander Stoep <jeffv@...gle.com> 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>
> ---
>  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))
> --
> 2.2.0.rc0.207.ga3a616c
>
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-- 
Nick Kralevich | Android Security | nnk@...gle.com | 650.214.4037
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