From: "J. Bruce Fields" <bfields@fieldses.org>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: "J. Bruce Fields" <bfields@redhat.com>,
Oleg Drokin <green@linuxhacker.ru>,
Jeff Layton <jlayton@poochiereds.net>,
linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/7] nfsd: remove redundant i_lookup check
Date: Sun, 24 Jul 2016 08:10:14 -0400 [thread overview]
Message-ID: <20160724121014.GA20985@fieldses.org> (raw)
In-Reply-To: <20160724002152.GN2356@ZenIV.linux.org.uk>
On Sun, Jul 24, 2016 at 01:22:06AM +0100, Al Viro wrote:
> On Fri, Jul 22, 2016 at 01:48:52PM -0400, J. Bruce Fields wrote:
> > From: "J. Bruce Fields" <bfields@redhat.com>
> >
> > I'm not sure why this was added. It doesn't seem necessary, and no
> > other caller does this.
>
> lookup_one_len() will explode if you call it for non-directory (==
> !d_can_lookup(), i.e. something without ->lookup()). So unless the callers
> do guarantee that check being true, it *is* needed.
Both callers call fh_verify(.,.,S_IFDIR,.), so at this point we know
that i_mode & S_IFMT == S_IFDIR. Is there some odd case where that's
insufficient? If so, I think there may be bugs elsewhere in nfsd. If
not, I'll add a note to the changelog.
Thanks for reminding me to check this, I hadn't thought of that as an
"is this a directory" check, it makes more sense now.
--b.
next prev parent reply other threads:[~2016-07-24 12:10 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-08 1:47 [PATCH] nfsd: Make creates return EEXIST correctly instead of EPERM Oleg Drokin
2016-07-08 11:02 ` Jeff Layton
2016-07-08 15:14 ` Oleg Drokin
2016-07-08 15:53 ` Jeff Layton
2016-07-08 15:59 ` Oleg Drokin
2016-07-08 16:17 ` Jeff Layton
2016-07-08 16:28 ` Oleg Drokin
2016-07-09 2:52 ` Al Viro
2016-07-09 2:58 ` Oleg Drokin
2016-07-09 3:13 ` Al Viro
2016-07-08 16:04 ` J. Bruce Fields
2016-07-08 16:16 ` Oleg Drokin
2016-07-08 20:49 ` J. Bruce Fields
2016-07-08 21:47 ` Oleg Drokin
2016-07-08 21:47 ` Oleg Drokin
2016-07-09 3:10 ` Al Viro
2016-07-09 3:41 ` Oleg Drokin
2016-07-13 19:00 ` J. Bruce Fields
2016-07-08 20:54 ` J. Bruce Fields
2016-07-08 21:53 ` Oleg Drokin
2016-07-21 20:34 ` J. Bruce Fields
2016-07-21 20:37 ` Oleg Drokin
2016-07-22 1:57 ` J. Bruce Fields
2016-07-22 6:35 ` Oleg Drokin
2016-07-22 10:55 ` J. Bruce Fields
2016-07-22 15:13 ` Oleg Drokin
2016-07-22 17:48 ` J. Bruce Fields
2016-07-22 17:48 ` [PATCH 1/7] nfsd: Make creates return EEXIST instead of EACCES J. Bruce Fields
2016-07-22 17:48 ` [PATCH 2/7] nfsd: remove redundant zero-length check from create J. Bruce Fields
2016-07-22 17:48 ` [PATCH 3/7] nfsd: remove redundant i_lookup check J. Bruce Fields
2016-07-24 0:22 ` Al Viro
2016-07-24 12:10 ` J. Bruce Fields [this message]
2016-07-24 14:23 ` Al Viro
2016-07-24 20:21 ` J. Bruce Fields
2016-07-22 17:48 ` [PATCH 4/7] nfsd: reorganize nfsd_create J. Bruce Fields
2016-07-22 17:48 ` [PATCH 5/7] nfsd: remove unnecessary positive-dentry check J. Bruce Fields
2016-07-22 17:48 ` [PATCH 6/7] nfsd: clean up bad-type check in nfsd_create_locked J. Bruce Fields
2016-07-22 17:48 ` [PATCH 7/7] nfsd: drop unnecessary MAY_EXEC check from create J. Bruce Fields
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