netdev - Re: [PATCH net-next 2/3] net: sctp: sctp_association

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Date:	Fri, 7 Jun 2013 07:00:54 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] net: sctp: sctp_association_init: hold refs
 in reverse order

On Fri, Jun 07, 2013 at 10:35:05AM +0200, Daniel Borkmann wrote:
> In case we need to bail out for whatever reason during assoc
> init, we call sctp_endpoint_put() and then sock_put(), however,
> we've hold both refs in reverse order, so first sctp_endpoint_hold()
> and then sock_hold(). Reverse this, so that we have sock_hold()
> with sctp_endpoint_hold() first and then in error case
> sctp_endpoint_put() and then sock_put(). Actually shouldn't
> matter much since we just increase an atomic, but that way, it's
> more clean.
> 
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> ---
>  net/sctp/associola.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/net/sctp/associola.c b/net/sctp/associola.c
> index 91cfd8f..04795fb 100644
> --- a/net/sctp/associola.c
> +++ b/net/sctp/associola.c
> @@ -86,11 +86,10 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
>  
>  	/* Discarding const is appropriate here.  */
>  	asoc->ep = (struct sctp_endpoint *)ep;
> -	sctp_endpoint_hold(asoc->ep);
> -
> -	/* Hold the sock.  */
>  	asoc->base.sk = (struct sock *)sk;
> +
>  	sock_hold(asoc->base.sk);
> +	sctp_endpoint_hold(asoc->ep);
>  
>  	/* Initialize the common base substructure.  */
>  	asoc->base.type = SCTP_EP_TYPE_ASSOCIATION;

This looks good, but you may want to instead reverse the order in which we do
the puts at fail_init, as other call sites that hold both endpoint socket do so
in endpoint, sock order, and it would probably be nice to be consistent in that
order.

Neil

> -- 
> 1.7.11.7
> 
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