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

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Date:   Wed, 4 Mar 2020 14:53:16 +0800
From:   Qiujun Huang <hqjagain@...il.com>
To:     Steve French <smfrench@...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'

On Wed, Mar 4, 2020 at 2:23 PM Steve French <smfrench@...il.com> wrote:
>
> Isn't it not used because of a potential bug - missing returning an
> error in two cases.

I get it, thanks.

>
> 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?

ok, I'll send v2.
>
> 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