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

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Date:	Sat, 8 Jun 2013 20:21:59 -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 01:38:56PM +0200, Daniel Borkmann wrote:
> On 06/07/2013 01:00 PM, Neil Horman wrote:
> >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.
> 
> Thanks, will do. When we have clarified the 1st patch, I'll simply respin the
> entire patchset and send a v2.
> 
Sounds great, thanks.  Just FYI, I'm out of town so may not respond super fast.
Will do my best though.
Neil

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