linux-kernel - Re: [PATCH 15/46] selinux: One check and function call less in genfs

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Date:   Tue, 17 Jan 2017 08:32:43 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
        Eric Paris <eparis@...isplace.org>,
        James Morris <james.l.morris@...cle.com>,
        Paul Moore <paul@...l-moore.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        William Roberts <william.c.roberts@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 15/46] selinux: One check and function call less in
 genfs_read() after error detection

On 1/15/2017 7:15 AM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 14 Jan 2017 18:29:20 +0100
>
> Adjust a jump target to avoid a check repetition at the end after a memory
> allocation failed for the local variable "newgenfs".
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  security/selinux/ss/policydb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
> index 5dc31faa601f..e7b882251da8 100644
> --- a/security/selinux/ss/policydb.c
> +++ b/security/selinux/ss/policydb.c
> @@ -2015,7 +2015,7 @@ static int genfs_read(struct policydb *p, void *fp)
>  		newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
>  		if (!newgenfs) {
>  			rc = -ENOMEM;
> -			goto out;
> +			goto exit;
>  		}
>  
>  		rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
> @@ -2101,7 +2101,7 @@ static int genfs_read(struct policydb *p, void *fp)
>  		kfree(newgenfs);
>  	}
>  	ocontext_destroy(newc, OCON_FSUSE);
> -
> +exit:
>  	return rc;

Why not replace the "goto out" with "return rc" rather
than add a target?

>  }
>