linux-kernel - Re: [PATCH] selinux: remove redundant assignment to str

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Message-ID: <CAHC9VhRT8WRfc4MvHs_4bN-gi3L7b8kqiuJ9=rTX=zbLgtWoYA@mail.gmail.com>
Date:   Mon, 16 Oct 2017 18:35:34 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E . Hallyn" <serge@...lyn.com>, selinux@...ho.nsa.gov,
        linux-security-module@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selinux: remove redundant assignment to str

On Sat, Oct 14, 2017 at 8:46 AM, Colin King <colin.king@...onical.com> wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> str is being assigned to an empty string but str is never being
> read after that, so the assignment is redundant and can be removed.
> Moving the declaration of str to a more localised block, cleans up
> clang warning: "Value stored to 'str' is never read"
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  security/selinux/hooks.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

Merged, thanks.

> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 07f35f3b4a13..3daf3369c3b4 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -3177,18 +3177,17 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
>                 if (!has_cap_mac_admin(true)) {
>                         struct audit_buffer *ab;
>                         size_t audit_size;
> -                       const char *str;
>
>                         /* We strip a nul only if it is at the end, otherwise the
>                          * context contains a nul and we should audit that */
>                         if (value) {
> -                               str = value;
> +                               const char *str = value;
> +
>                                 if (str[size - 1] == '\0')
>                                         audit_size = size - 1;
>                                 else
>                                         audit_size = size;
>                         } else {
> -                               str = "";
>                                 audit_size = 0;
>                         }
>                         ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR);
> --
> 2.14.1
>



-- 
paul moore
www.paul-moore.com