linux-kernel - Re: [take3 3/4] kevent: Network AIO, socket notifications.

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Message-ID: <20060803101342.GA18885@2ka.mipt.ru>
Date:	Thu, 3 Aug 2006 14:13:43 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>
Subject: Re: [take3 3/4] kevent: Network AIO, socket notifications.

On Thu, Aug 03, 2006 at 11:54:26AM +0200, Eric Dumazet (dada1@...mosbay.com) wrote:
> On Thursday 03 August 2006 11:46, Evgeniy Polyakov wrote:
> > Network AIO, socket notifications.
> >
> > This patchset includes socket notifications and network asynchronous IO.
> > Network AIO is based on kevent and works as usual kevent storage on top
> > of inode.

> > +	file = fget_light(k->event.id.raw[0], &fput_needed);
> > +	if (!file)
> > +		return -ENODEV;
> > +
> > +	err = -EINVAL;
> > +	if (!file->f_dentry || !file->f_dentry->d_inode)
> > +		goto err_out_fput;
> 
> How can you be 100% sure this file is actually a socket here ?
> (Another thread could close the fd and this fd can now point to another file)
> 
> You should do
> if (file->f_op != &socket_file_ops)
> 	goto err_out_fput;
> sk = file->private_data;  /* set in sock_map_fd */ 

That will be socket, not sock, but that check is definitely needed in
both socket and network aio code.
Thanks Eric.

> Eric

-- 
	Evgeniy Polyakov
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