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

Evgeniy Polyakov
2006-08-03T10:14:45Z

On Thu, Aug 03, 2006 at 11:54:26AM +0200, Eric Dumazet (dada1@cosmosbay.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