linux-kernel - Re: [PATCH] fs/cifs/cifsacl: remove set but not used variable 'rc'

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Message-ID: <CAH2r5mv9N_vo+vX7TaaPc2MBNFgsOAO6nGZcfaiaz8JqjM0BnQ@mail.gmail.com>
Date:   Wed, 4 Mar 2020 00:23:16 -0600
From:   Steve French <smfrench@...il.com>
To:     Qiujun Huang <hqjagain@...il.com>
Cc:     Steve French <sfrench@...ba.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        samba-technical <samba-technical@...ts.samba.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs/cifs/cifsacl: remove set but not used variable 'rc'

Isn't it not used because of a potential bug - missing returning an
error in two cases.

If we leave the two lines you removed in - and set rc=0 in its
declaration (and return rc at the end as you originally had suggested)
- doesn't that solve the problem?  A minor modification to your first
proposed patch?

On Tue, Mar 3, 2020 at 5:39 PM Qiujun Huang <hqjagain@...il.com> wrote:
>
>  It is set but not used, So can be removed.
>
> Signed-off-by: Qiujun Huang <hqjagain@...il.com>
> ---
>  fs/cifs/cifsacl.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
> index 716574a..1cf3916 100644
> --- a/fs/cifs/cifsacl.c
> +++ b/fs/cifs/cifsacl.c
> @@ -342,7 +342,6 @@
>  sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid,
>                 struct cifs_fattr *fattr, uint sidtype)
>  {
> -       int rc;
>         struct key *sidkey;
>         char *sidstr;
>         const struct cred *saved_cred;
> @@ -403,7 +402,6 @@
>         saved_cred = override_creds(root_cred);
>         sidkey = request_key(&cifs_idmap_key_type, sidstr, "");
>         if (IS_ERR(sidkey)) {
> -               rc = -EINVAL;
>                 cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n",
>                          __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g');
>                 goto out_revert_creds;
> @@ -416,7 +414,6 @@
>          */
>         BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t));
>         if (sidkey->datalen != sizeof(uid_t)) {
> -               rc = -EIO;
>                 cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n",
>                          __func__, sidkey->datalen);
>                 key_invalidate(sidkey);
> --
> 1.8.3.1
>


-- 
Thanks,

Steve