From: Xin Long <lucien.xin@gmail.com>
Date: Tue, 22 Jan 2019 02:39:34 +0800
Subject: sctp: improve the events for sctp stream reset
Git-commit: 2e6dc4d95110becfe0ff4c3d4749c33ea166e9e7
Patch-mainline: v5.0-rc4
References: networking-stable-19_02_01

This patch is to improve sctp stream reset events in 4 places:

  1. In sctp_process_strreset_outreq(), the flag should always be set with
     SCTP_STREAM_RESET_INCOMING_SSN instead of OUTGOING, as receiver's in
     stream is reset here.
  2. In sctp_process_strreset_outreq(), move up SCTP_STRRESET_ERR_WRONG_SSN
     check, as the reset has to succeed after reconf_timer stops for the
     in stream reset request retransmission.
  3. In sctp_process_strreset_inreq(), no event should be sent, as no in
     or out stream is reset here.
  4. In sctp_process_strreset_resp(), SCTP_STREAM_RESET_INCOMING_SSN or
     OUTGOING event should always be sent for stream reset requests, no
     matter it fails or succeeds to process the request.

Fixes: 810544764536 ("sctp: implement receiver-side procedures for the Outgoing SSN Reset Request Parameter")
Fixes: 16e1a91965b0 ("sctp: implement receiver-side procedures for the Incoming SSN Reset Request Parameter")
Fixes: 11ae76e67a17 ("sctp: implement receiver-side procedures for the Reconf Response 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: Jiri Slaby <jslaby@suse.cz>
---
 net/sctp/stream.c |   39 +++++++++++++++++----------------------
 1 file changed, 17 insertions(+), 22 deletions(-)

--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -373,7 +373,7 @@ struct sctp_chunk *sctp_process_strreset
 {
 	struct sctp_strreset_outreq *outreq = param.v;
 	struct sctp_stream *stream = asoc->stream;
-	__u16 i, nums, flags = 0, *str_p = NULL;
+	__u16 i, nums, *str_p = NULL;
 	__u32 result = SCTP_STRRESET_DENIED;
 	__u32 request_seq;
 
@@ -403,6 +403,15 @@ struct sctp_chunk *sctp_process_strreset
 	if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
 		goto out;
 
+	nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
+	str_p = outreq->list_of_streams;
+	for (i = 0; i < nums; i++) {
+		if (ntohs(str_p[i]) >= stream->incnt) {
+			result = SCTP_STRRESET_ERR_WRONG_SSN;
+			goto out;
+		}
+	}
+
 	if (asoc->strreset_chunk) {
 		if (!sctp_chunk_lookup_strreset_param(
 				asoc, outreq->response_seq,
@@ -425,32 +434,19 @@ struct sctp_chunk *sctp_process_strreset
 			sctp_chunk_put(asoc->strreset_chunk);
 			asoc->strreset_chunk = NULL;
 		}
-
-		flags = SCTP_STREAM_RESET_INCOMING_SSN;
 	}
 
-	nums = (ntohs(param.p->length) - sizeof(*outreq)) / 2;
-	if (nums) {
-		str_p = outreq->list_of_streams;
-		for (i = 0; i < nums; i++) {
-			if (ntohs(str_p[i]) >= stream->incnt) {
-				result = SCTP_STRRESET_ERR_WRONG_SSN;
-				goto out;
-			}
-		}
-
+	if (nums)
 		for (i = 0; i < nums; i++)
 			stream->in[ntohs(str_p[i])].ssn = 0;
-	} else {
+	else
 		for (i = 0; i < stream->incnt; i++)
 			stream->in[i].ssn = 0;
-	}
 
 	result = SCTP_STRRESET_PERFORMED;
 
 	*evp = sctp_ulpevent_make_stream_reset_event(asoc,
-		flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
-		GFP_ATOMIC);
+		SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
 
 out:
 	sctp_update_strreset_result(asoc, result);
@@ -519,9 +515,6 @@ struct sctp_chunk *sctp_process_strreset
 
 	result = SCTP_STRRESET_PERFORMED;
 
-	*evp = sctp_ulpevent_make_stream_reset_event(asoc,
-		SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
-
 out:
 	sctp_update_strreset_result(asoc, result);
 err:
@@ -811,10 +804,10 @@ struct sctp_chunk *sctp_process_strreset
 				for (i = 0; i < stream->outcnt; i++)
 					stream->out[i].ssn = 0;
 			}
-
-			flags = SCTP_STREAM_RESET_OUTGOING_SSN;
 		}
 
+		flags |= SCTP_STREAM_RESET_OUTGOING_SSN;
+
 		for (i = 0; i < stream->outcnt; i++)
 			stream->out[i].state = SCTP_STREAM_OPEN;
 
@@ -832,6 +825,8 @@ struct sctp_chunk *sctp_process_strreset
 		str_p = inreq->list_of_streams;
 		nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 2;
 
+		flags |= SCTP_STREAM_RESET_INCOMING_SSN;
+
 		*evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
 			nums, str_p, GFP_ATOMIC);
 	} else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {