linux-kernel - Re: [PATCH 21/46] selinux: Two function calls less in range

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Message-ID: <e3fcbcbb-a1fb-ef39-268f-2e79532739b1@schaufler-ca.com>
Date:   Tue, 17 Jan 2017 08:35:23 -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 21/46] selinux: Two function calls less in range_read()
 after error detection

On 1/15/2017 7:21 AM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 14 Jan 2017 20:20:15 +0100
>
> Adjust a jump target to avoid two calls of the function "kfree" at the end
> after a memory allocation failed for the local variable "rt".
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  security/selinux/ss/policydb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
> index 4cd96ce51322..0d2f64558c0a 100644
> --- a/security/selinux/ss/policydb.c
> +++ b/security/selinux/ss/policydb.c
> @@ -1857,7 +1857,7 @@ static int range_read(struct policydb *p, void *fp)
>  		rt = kzalloc(sizeof(*rt), GFP_KERNEL);
>  		if (!rt) {
>  			rc = -ENOMEM;
> -			goto out;
> +			goto exit;

Why not "return rc;"?
goto to a return is wrong.

>  		}
>  
>  		rc = next_entry(buf, fp, (sizeof(u32) * 2));
> @@ -1909,6 +1909,7 @@ static int range_read(struct policydb *p, void *fp)
>  out:
>  	kfree(rt);
>  	kfree(r);
> +exit:
>  	return rc;
>  }
>