sctp: improve the events for sctp stream adding

[ 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@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index 6c188b0..80e0ae5 100644 (file)
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -866,6 +866,14 @@ struct sctp_chunk *sctp_process_strreset_addstrm_out(
        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_addstrm_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;
-
        stream->incnt = incnt;
 
        result = SCTP_STRRESET_PERFORMED;
@@ -966,9 +966,6 @@ struct sctp_chunk *sctp_process_strreset_addstrm_in(
 
        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: