netdev - Re: [PATCH] net: fix kernel

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Message-Id: <20071004.165559.123919608.davem@davemloft.net>
Date:	Thu, 04 Oct 2007 16:55:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tonyb@...ernetics.com
Cc:	jmorris@...ei.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: fix kernel_accept() error path

From: Tony Battersby <tonyb@...ernetics.com>
Date: Thu, 04 Oct 2007 18:12:53 -0400

> Here is an example of what I would consider "reasonable code" that would
> fail:
> 
> int example()
> {
>     struct socket *conn_socket = NULL;
>     int err;
> 
>     ...
> 
>     if ((err = kernel_accept(sock, &conn_socket, 0)) < 0)
>         goto out_cleanup;
> 
>     [do whatever with conn_socket]
> 
>  out_cleanup:
> 
>     if (conn_socket != NULL)
>         sock_release(&conn_socket);
> 
>     return err;
> }

This is a grey area.

I'd say you shouldn't be trying to do cleanups on conn_socket unless
kernel_accept() gave you a success return.

However, kernel_accept() is guilty of leaving a stray pointer
in conn_socket, in fact a reference to freed memory.  So
from that perspective we should put your patch in.

Please resubmit, at least to me under seperate cover,thanks.
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