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Date: Mon, 4 Feb 2019 11:36:39 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Ying Xu <yinxu@...hat.com>, Xin Long <lucien.xin@...il.com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.20 19/80] sctp: improve the events for sctp stream adding 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xin Long <lucien.xin@...il.com> [ Upstream commit 8220c870cb0f4eaa4e335c9645dbd9a1c461c1dd ] This patch is to improve sctp stream adding events in 2 places: 1. In sctp_process_strreset_addstrm_out(), move up SCTP_MAX_STREAM and in stream allocation failure checks, as the adding has to succeed after reconf_timer stops for the in stream adding request retransmission. 3. In sctp_process_strreset_addstrm_in(), no event should be sent, as no in or out stream is added here. Fixes: 50a41591f110 ("sctp: implement receiver-side procedures for the Add Outgoing Streams Request Parameter") Fixes: c5c4ebb3ab87 ("sctp: implement receiver-side procedures for the Add Incoming Streams Request Parameter") Reported-by: Ying Xu <yinxu@...hat.com> Signed-off-by: Xin Long <lucien.xin@...il.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/sctp/stream.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) --- a/net/sctp/stream.c +++ b/net/sctp/stream.c @@ -866,6 +866,14 @@ struct sctp_chunk *sctp_process_strreset if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) goto out; + in = ntohs(addstrm->number_of_streams); + incnt = stream->incnt + in; + if (!in || incnt > SCTP_MAX_STREAM) + goto out; + + if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC)) + goto out; + if (asoc->strreset_chunk) { if (!sctp_chunk_lookup_strreset_param( asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) { @@ -889,14 +897,6 @@ struct sctp_chunk *sctp_process_strreset } } - in = ntohs(addstrm->number_of_streams); - incnt = stream->incnt + in; - if (!in || incnt > SCTP_MAX_STREAM) - goto out; - - if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC)) - goto out; - stream->incnt = incnt; result = SCTP_STRRESET_PERFORMED; @@ -966,9 +966,6 @@ struct sctp_chunk *sctp_process_strreset result = SCTP_STRRESET_PERFORMED; - *evp = sctp_ulpevent_make_stream_change_event(asoc, - 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC); - out: sctp_update_strreset_result(asoc, result); err:
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