Subject: Re: [PATCHv6 net-next 4/6] sctp: implement sender-side procedures for SSN/TSN Reset Request Parameter

From: Marcelo Ricardo Leitner <[email-masked]>
Date: Wed, 8 Feb 2017 19:50:06 -0200

On Wed, Feb 08, 2017 at 07:48:01PM -0200, Marcelo Ricardo Leitner wrote:
> Hi Xin,
> 
> On Thu, Feb 09, 2017 at 01:18:18AM +0800, Xin Long wrote:
> > This patch is to implement Sender-Side Procedures for the SSN/TSN
> > Reset Request Parameter descibed in rfc6525 section 5.1.4.
> > 
> > It is also to add sockopt SCTP_RESET_ASSOC in rfc6525 section 6.3.3
> > for users.
> > 
> > Signed-off-by: Xin Long <[email-masked]>
> ...
> > +
> > +int sctp_send_reset_assoc(struct sctp_association *asoc)
> > +{
> > +	struct sctp_chunk *chunk = NULL;
> > +	int retval;
> > +	__u16 i;
> > +
> > +	if (!asoc->peer.reconf_capable ||
> > +	    !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
> > +		return -ENOPROTOOPT;
> > +
> > +	if (asoc->strreset_outstanding)
> > +		return -EINPROGRESS;
> > +
> > +	chunk = sctp_make_strreset_tsnreq(asoc);
>           ^--- refcnf = 1 (as per sctp_chunkify())
> 
> > +	if (!chunk)
> > +		return -ENOMEM;
> > +
> > +	/* Block further xmit of data until this request is completed */
> > +	for (i = 0; i < asoc->stream->outcnt; i++)
> > +		asoc->stream->out[i].state = SCTP_STREAM_CLOSED;
> > +
> > +	asoc->strreset_chunk = chunk;
> > +	sctp_chunk_hold(asoc->strreset_chunk);
>                                  ^--- refcnf = 2
> > +
> > +	retval = sctp_send_reconf(asoc, chunk);
> > +	if (retval) {
> > +		sctp_chunk_put(asoc->strreset_chunk);
>                                           ^--- refcnf = 1
> 
> Won't we leak the chunk here?

No we won't, sctp_send_reconf() frees it for us, aye.