linux-kernel - Re: [PATCH 1/2] vfs: parse: deal with zero length string value

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Message-ID: <20220628130348.i5ckfdnyzjtoqgb3@wittgenstein>
Date:   Tue, 28 Jun 2022 15:03:48 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Ian Kent <raven@...maw.net>
Cc:     Al Viro <viro@...IV.linux.org.uk>,
        Siddhesh Poyarekar <siddhesh@...plt.org>,
        David Howells <dhowells@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Carlos Maiolino <cmaiolino@...hat.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] vfs: parse: deal with zero length string value

On Fri, Jun 17, 2022 at 01:09:03PM +0800, Ian Kent wrote:
> Parsing an fs string that has zero length should result in the parameter
> being set to NULL so that downstream processing handles it correctly.
> For example, the proc mount table processing should print "(none)" in
> this case to preserve mount record field count, but if the value points
> to the NULL string this doesn't happen.
> 
> Signed-off-by: Ian Kent <raven@...maw.net>
> ---

Makes sense. Though I feel this is might be one of those instances where
we detect that some code isn't prepared for param.string to be NULL at
some point...
Reviewed-by: Christian Brauner (Microsoft) <brauner@...nel.org>