linux-kernel - Re: [PATCH] dcache: error out if the name buffer is too short

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Message-ID: <20140126153737.GA8184@redhat.com>
Date:	Sun, 26 Jan 2014 16:37:37 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dcache: error out if the name buffer is too short

On 01/24, Oleg Nesterov wrote:
>
> And probably you are right, the fix should be as simple as possible.
> But can't we also simplify __dentry_path? Unless I missed something
> we can move prepend() up, before rcu_read_lock(), "move Get '/' right"
> into that prepend, and even kill retval... OK, most probably I missed
> something,

Of course I missed something ;)

> but at first glance we can do something like
>
> 	static char *__dentry_path(struct dentry *dentry, char *buf, int buflen)
> 	{
> 		int len, seq = 0;
> 		int error = 0;
> 		char *end;
>
> 		buf += buflen;
> 		/* Get '/' right, write "/\0" at the end */
> 		if (prepend(&buf, &buflen, "/", 2))
> 			goto Elong;

Heh. Not sure what I was thinking about, but this looks obviously wrong
when I re-read my email. This will add the extra "/" at the end, unless
IS_ROOT().

Sorry for noise.

Oleg.

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