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

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Date:   Thu, 9 Feb 2017 15:58:56 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        Neil Horman <nhorman@...driver.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        davem <davem@...emloft.net>
Subject: Re: [PATCHv6 net-next 4/6] sctp: implement sender-side procedures for
 SSN/TSN Reset Request Parameter

On Thu, Feb 9, 2017 at 5:50 AM, Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
> 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 <lucien.xin@...il.com>
>> ...
>> > +
>> > +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.
yups. :)

>
>