linux-kernel - Re: [PATCH 5/5] security/selinux/ss: correct size computation

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Date:	Mon, 07 Dec 2009 10:02:23 -0500
From:	Eric Paris <eparis@...hat.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 5/5] security/selinux/ss: correct size computation

On Sun, 2009-12-06 at 10:16 +0100, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> The size argument to kcalloc should be the size of desired structure,
> not the pointer to it.
> 
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @expression@
> expression *x;
> @@
> 
> x =
>  <+...
> -sizeof(x)
> +sizeof(*x)
> ...+>// </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

Acked-by: Eric Paris <eparis@...hat.com>

no real hurry, to get this in, the sizeof() is the same in either case,
but it should be fixed.


> 
> ---
>  security/selinux/ss/services.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff -u -p a/security/selinux/ss/services.c b/security/selinux/ss/services.c
> --- a/security/selinux/ss/services.c
> +++ b/security/selinux/ss/services.c
> @@ -2555,7 +2555,7 @@ int security_get_classes(char ***classes
>  	read_lock(&policy_rwlock);
>  
>  	*nclasses = policydb.p_classes.nprim;
> -	*classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC);
> +	*classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC);
>  	if (!*classes)
>  		goto out;
>  
> @@ -2602,7 +2602,7 @@ int security_get_permissions(char *class
>  	}
>  
>  	*nperms = match->permissions.nprim;
> -	*perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC);
> +	*perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC);
>  	if (!*perms)
>  		goto out;
>  


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