[PATCH 4.14 15/46] sctp: improve the events for sctp stream adding

Greg Kroah-Hartman
2019-02-04T10:44:43Z

From: Xin Long <lucien.xin@gmail.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@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>
---
net/sctp/stream.c | 23 ++++++++++-------------
1 file changed, 10 insertions(+), 13 deletions(-)

--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -642,6 +642,16 @@ 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;
+
+ streamin = krealloc(stream->in, incnt * sizeof(*streamin),
+ GFP_ATOMIC);
+ if (!streamin)
+ goto out;
+
if (asoc->strreset_chunk) {
if (!sctp_chunk_lookup_strreset_param(
asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
@@ -665,16 +675,6 @@ struct sctp_chunk *sctp_process_strreset
}
}

- in = ntohs(addstrm->number_of_streams);
- incnt = stream->incnt + in;
- if (!in || incnt > SCTP_MAX_STREAM)
- goto out;
-
- streamin = krealloc(stream->in, incnt * sizeof(*streamin),
- GFP_ATOMIC);
- if (!streamin)
- goto out;
-
memset(streamin + stream->incnt, 0, in * sizeof(*streamin));
stream->in = streamin;
stream->incnt = incnt;
@@ -750,9 +750,6 @@ 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);