linux-kernel - Re: [take25 6/6] kevent: Pipe notifications.

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Message-Id: <200611221220.50245.dada1@cosmosbay.com>
Date:	Wed, 22 Nov 2006 12:20:50 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	Andrew Morton <akpm@...l.org>, netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Chase Venters <chase.venters@...entec.com>,
	Johann Borck <johann.borck@...sedata.com>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org>
Subject: Re: [take25 6/6] kevent: Pipe notifications.

On Tuesday 21 November 2006 17:29, Evgeniy Polyakov wrote:
> Pipe notifications.

> +int kevent_pipe_enqueue(struct kevent *k)
> +{
> +	struct file *pipe;
> +	int err = -EBADF;
> +	struct inode *inode;
> +
> +	pipe = fget(k->event.id.raw[0]);
> +	if (!pipe)
> +		goto err_out_exit;
> +
> +	inode = igrab(pipe->f_dentry->d_inode);
> +	if (!inode)
> +		goto err_out_fput;
> +

Well...

How can you be sure 'pipe/inode' really refers to a pipe/fifo here ?

Hint : i_pipe <> NULL is not sufficient because i_pipe, i_bdev, i_cdev share 
the same location. (check pipe_info() in fs/splice.c)

So I guess you need :

err = -EINVAL;
if  (!S_ISFIFO(inode->i_mode))
	goto err_out_iput;



Eric
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