git: 9e8d5ea2b557 - stable/13 - sctp: provide consistent stream information in case of early errors

[Michael Tuexen]

The branch stable/13 has been updated by tuexen:

URL: https://cgit.FreeBSD.org/src/commit/?id=9e8d5ea2b5579eee381375bb10a40b6c7197f1d6

commit 9e8d5ea2b5579eee381375bb10a40b6c7197f1d6
Author:     Michael Tuexen <tuexen at FreeBSD.org>
AuthorDate: 2021-07-09 12:15:22 +0000
Commit:     Michael Tuexen <tuexen at FreeBSD.org>
CommitDate: 2021-07-13 18:30:21 +0000

    sctp: provide consistent stream information in case of early errors
    
    While there, make sure the function is called correctly.
    
    (cherry picked from commit ce64352a702db1fef8c0e33f3a6f13a3e5d92736)
---
 sys/netinet/sctputil.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/sys/netinet/sctputil.c b/sys/netinet/sctputil.c
index 1f909fa1d8d4..21e49bdfcb23 100644
--- a/sys/netinet/sctputil.c
+++ b/sys/netinet/sctputil.c
@@ -3163,6 +3163,8 @@ sctp_notify_assoc_change(uint16_t state, struct sctp_tcb *stcb,
 	uint16_t abort_len;
 	unsigned int i;
 
+	KASSERT((abort == NULL) || (from_peer != 0),
+	    ("sctp_notify_assoc_change: ABORT chunk provided for local termination"));
 	if (stcb == NULL) {
 		return;
 	}
@@ -3202,9 +3204,13 @@ sctp_notify_assoc_change(uint16_t state, struct sctp_tcb *stcb,
 		sac->sac_length = sizeof(struct sctp_assoc_change);
 		sac->sac_state = state;
 		sac->sac_error = error;
-		/* XXX verify these stream counts */
-		sac->sac_outbound_streams = stcb->asoc.streamoutcnt;
-		sac->sac_inbound_streams = stcb->asoc.streamincnt;
+		if (state == SCTP_CANT_STR_ASSOC) {
+			sac->sac_outbound_streams = 0;
+			sac->sac_inbound_streams = 0;
+		} else {
+			sac->sac_outbound_streams = stcb->asoc.streamoutcnt;
+			sac->sac_inbound_streams = stcb->asoc.streamincnt;
+		}
 		sac->sac_assoc_id = sctp_get_associd(stcb);
 		if (notif_len > sizeof(struct sctp_assoc_change)) {
 			if ((state == SCTP_COMM_UP) || (state == SCTP_RESTART)) {