[PATCH net v3 0/2] sctp: handle wrapped and duplicate RECONF responses

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* [PATCH net v3 0/2] sctp: handle wrapped and duplicate RECONF responses
@ 2026-08-21  9:14 Jun Yang
  2026-08-21  9:14 ` [PATCH net v3 1/2] sctp: distinguish sequence zero from wildcard in reconf lookup Jun Yang
  2026-08-21  9:14 ` [PATCH net v3 2/2] sctp: fix stream->outcnt underflow on duplicate RECONF responses Jun Yang
  0 siblings, 2 replies; 3+ messages in thread
From: Jun Yang @ 2026-08-21  9:14 UTC (permalink / raw)
  To: linux-sctp, netdev
  Cc: marcelo.leitner, lucien.xin, davem, edumazet, kuba, pabeni, horms,
	Jun Yang

Fix response sequence zero lookup first, then make RECONF response
handling idempotent with an outstanding-request bitmask.

Jun Yang (2):
  sctp: distinguish sequence zero from wildcard in reconf lookup
  sctp: fix stream->outcnt underflow on duplicate RECONF responses

 include/net/sctp/structs.h |  2 +-
 net/sctp/stream.c          | 46 ++++++++++++++++++++++++++------------
 2 files changed, 33 insertions(+), 15 deletions(-)

---
Changes since v2:
 - Split the sequence-zero lookup fix into patch 1 as requested.

v2: https://lore.kernel.org/netdev/20260804113100.37840-1-juny24602@gmail.com/
--
2.55.0


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH net v3 1/2] sctp: distinguish sequence zero from wildcard in reconf lookup
  2026-08-21  9:14 [PATCH net v3 0/2] sctp: handle wrapped and duplicate RECONF responses Jun Yang
@ 2026-08-21  9:14 ` Jun Yang
  2026-08-21  9:14 ` [PATCH net v3 2/2] sctp: fix stream->outcnt underflow on duplicate RECONF responses Jun Yang
  1 sibling, 0 replies; 3+ messages in thread
From: Jun Yang @ 2026-08-21  9:14 UTC (permalink / raw)
  To: linux-sctp, netdev
  Cc: marcelo.leitner, lucien.xin, davem, edumazet, kuba, pabeni, horms,
	Jun Yang, stable

Zero is a valid response sequence after strreset_outseq wraps, but
sctp_chunk_lookup_strreset_param() currently treats it as a wildcard.

Add match_seq so response lookups match zero exactly while the one
type-only lookup can still ignore the sequence.

Fixes: 50a41591f110 ("sctp: implement receiver-side procedures for the Add Outgoing Streams Request Parameter")
Cc: stable@kernel.org
Suggested-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jun Yang <junvyyang@tencent.com>
---
 net/sctp/stream.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index 34ffe6c..cfca5aa 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -482,7 +482,7 @@ out:
 
 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 			struct sctp_association *asoc, __be32 resp_seq,
-			__be16 type)
+			__be16 type, bool match_seq)
 {
 	struct sctp_chunk *chunk = asoc->strreset_chunk;
 	struct sctp_reconf_chunk *hdr;
@@ -499,7 +499,7 @@ static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
 		 */
 		struct sctp_strreset_tsnreq *req = param.v;
 
-		if ((!resp_seq || req->request_seq == resp_seq) &&
+		if ((!match_seq || req->request_seq == resp_seq) &&
 		    (!type || type == req->param_hdr.type))
 			return param.v;
 	}
@@ -564,7 +564,7 @@ struct sctp_chunk *sctp_process_strreset_outreq(
 	if (asoc->strreset_chunk) {
 		if (!sctp_chunk_lookup_strreset_param(
 				asoc, outreq->response_seq,
-				SCTP_PARAM_RESET_IN_REQUEST)) {
+				SCTP_PARAM_RESET_IN_REQUEST, true)) {
 			/* same process with outstanding isn't 0 */
 			result = SCTP_STRRESET_ERR_IN_PROGRESS;
 			goto out;
@@ -816,7 +816,7 @@ struct sctp_chunk *sctp_process_strreset_addstrm_out(
 
 	if (asoc->strreset_chunk) {
 		if (!sctp_chunk_lookup_strreset_param(
-			asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
+			asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS, false)) {
 			/* same process with outstanding isn't 0 */
 			result = SCTP_STRRESET_ERR_IN_PROGRESS;
 			goto out;
@@ -927,7 +927,8 @@ struct sctp_chunk *sctp_process_strreset_resp(
 	struct sctp_paramhdr *req;
 	__u32 result;
 
-	req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
+	req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0,
+					       true);
 	if (!req)
 		return NULL;
 
-- 
2.55.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread

* [PATCH net v3 2/2] sctp: fix stream->outcnt underflow on duplicate RECONF responses
  2026-08-21  9:14 [PATCH net v3 0/2] sctp: handle wrapped and duplicate RECONF responses Jun Yang
  2026-08-21  9:14 ` [PATCH net v3 1/2] sctp: distinguish sequence zero from wildcard in reconf lookup Jun Yang
@ 2026-08-21  9:14 ` Jun Yang
  1 sibling, 0 replies; 3+ messages in thread
From: Jun Yang @ 2026-08-21  9:14 UTC (permalink / raw)
  To: linux-sctp, netdev
  Cc: marcelo.leitner, lucien.xin, davem, edumazet, kuba, pabeni, horms,
	Jun Yang, stable, TencentOS Corvus AI

A cached RECONF chunk may contain more than one request parameter.  A
duplicate response can therefore find and process the same ADD_OUT request
again while another parameter is still outstanding, rolling back outcnt
twice and possibly underflowing it.

Track outstanding request types as bits and clear each bit after its first
response.  Later responses for the same request are then ignored.

Fixes: 11ae76e67a17 ("sctp: implement receiver-side procedures for the Reconf Response Parameter")
Cc: stable@kernel.org
Reported-by: TencentOS Corvus AI <corvus@tencent.com>
Link: https://lore.kernel.org/netdev/20260730110225.37371-1-juny24602@gmail.com/
Suggested-by: Xin Long <lucien.xin@gmail.com>
Assisted-by: tencentos-corvus-ai:kimi-k3
Signed-off-by: Jun Yang <junvyyang@tencent.com>
---
v3:
 - Split the response_seq == 0 lookup fix into patch 1 (Simon Horman).
 - Keep the request bit helper local to stream.c.

v2:
 - Track outstanding requests by type instead of sequence (Xin Long).
 - Drop the redundant arithmetic guard (Xin Long).

v1: https://lore.kernel.org/netdev/20260730110225.37371-1-juny24602@gmail.com/

 include/net/sctp/structs.h |  2 +-
 net/sctp/stream.c          | 39 +++++++++++++++++++++++++++-----------
 2 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index cccc662..b21f23b 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -2057,7 +2057,7 @@ struct sctp_association {
 	     force_delay:1;
 
 	__u8 strreset_enable;
-	__u8 strreset_outstanding; /* request param count on the fly */
+	__u8 strreset_outstanding; /* request param bitmask on the fly */
 
 	__u32 strreset_outseq; /* Update after receiving response */
 	__u32 strreset_inseq; /* Update after receiving request */
diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index cfca5aa..e1a215d 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -22,6 +22,9 @@
 #include <net/sctp/sm.h>
 #include <net/sctp/stream_sched.h>
 
+#define SCTP_STRRESET_BIT(type) \
+	BIT(ntohs(type) - ntohs(SCTP_PARAM_RESET_OUT_REQUEST))
+
 static void sctp_stream_shrink_out(struct sctp_stream *stream, __u16 outcnt)
 {
 	struct sctp_association *asoc;
@@ -372,7 +375,9 @@ int sctp_send_reset_streams(struct sctp_association *asoc,
 		goto out;
 	}
 
-	asoc->strreset_outstanding = out + in;
+	asoc->strreset_outstanding =
+		(out ? SCTP_STRRESET_BIT(SCTP_PARAM_RESET_OUT_REQUEST) : 0) |
+		(in ? SCTP_STRRESET_BIT(SCTP_PARAM_RESET_IN_REQUEST) : 0);
 
 out:
 	return retval;
@@ -417,7 +422,8 @@ int sctp_send_reset_assoc(struct sctp_association *asoc)
 		return retval;
 	}
 
-	asoc->strreset_outstanding = 1;
+	asoc->strreset_outstanding =
+		SCTP_STRRESET_BIT(SCTP_PARAM_RESET_TSN_REQUEST);
 
 	return 0;
 }
@@ -474,7 +480,9 @@ int sctp_send_add_streams(struct sctp_association *asoc,
 		goto out;
 	}
 
-	asoc->strreset_outstanding = !!out + !!in;
+	asoc->strreset_outstanding =
+		(out ? SCTP_STRRESET_BIT(SCTP_PARAM_RESET_ADD_OUT_STREAMS) : 0) |
+		(in ? SCTP_STRRESET_BIT(SCTP_PARAM_RESET_ADD_IN_STREAMS) : 0);
 
 out:
 	return retval;
@@ -564,13 +572,16 @@ struct sctp_chunk *sctp_process_strreset_outreq(
 	if (asoc->strreset_chunk) {
 		if (!sctp_chunk_lookup_strreset_param(
 				asoc, outreq->response_seq,
-				SCTP_PARAM_RESET_IN_REQUEST, true)) {
+				SCTP_PARAM_RESET_IN_REQUEST, true) ||
+		    !(asoc->strreset_outstanding &
+		      SCTP_STRRESET_BIT(SCTP_PARAM_RESET_IN_REQUEST))) {
 			/* same process with outstanding isn't 0 */
 			result = SCTP_STRRESET_ERR_IN_PROGRESS;
 			goto out;
 		}
 
-		asoc->strreset_outstanding--;
+		asoc->strreset_outstanding &=
+			~SCTP_STRRESET_BIT(SCTP_PARAM_RESET_IN_REQUEST);
 		asoc->strreset_outseq++;
 
 		if (!asoc->strreset_outstanding) {
@@ -669,7 +680,8 @@ struct sctp_chunk *sctp_process_strreset_inreq(
 			SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
 
 	asoc->strreset_chunk = chunk;
-	asoc->strreset_outstanding = 1;
+	asoc->strreset_outstanding =
+		SCTP_STRRESET_BIT(SCTP_PARAM_RESET_OUT_REQUEST);
 	sctp_chunk_hold(asoc->strreset_chunk);
 
 	result = SCTP_STRRESET_PERFORMED;
@@ -816,13 +828,16 @@ struct sctp_chunk *sctp_process_strreset_addstrm_out(
 
 	if (asoc->strreset_chunk) {
 		if (!sctp_chunk_lookup_strreset_param(
-			asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS, false)) {
+			asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS, false) ||
+		    !(asoc->strreset_outstanding &
+		      SCTP_STRRESET_BIT(SCTP_PARAM_RESET_ADD_IN_STREAMS))) {
 			/* same process with outstanding isn't 0 */
 			result = SCTP_STRRESET_ERR_IN_PROGRESS;
 			goto out;
 		}
 
-		asoc->strreset_outstanding--;
+		asoc->strreset_outstanding &=
+			~SCTP_STRRESET_BIT(SCTP_PARAM_RESET_ADD_IN_STREAMS);
 		asoc->strreset_outseq++;
 
 		if (!asoc->strreset_outstanding) {
@@ -899,7 +914,8 @@ struct sctp_chunk *sctp_process_strreset_addstrm_in(
 		goto out;
 
 	asoc->strreset_chunk = chunk;
-	asoc->strreset_outstanding = 1;
+	asoc->strreset_outstanding =
+		SCTP_STRRESET_BIT(SCTP_PARAM_RESET_ADD_OUT_STREAMS);
 	sctp_chunk_hold(asoc->strreset_chunk);
 
 	stream->outcnt = outcnt;
@@ -929,7 +945,8 @@ struct sctp_chunk *sctp_process_strreset_resp(
 
 	req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0,
 					       true);
-	if (!req)
+	if (!req || !(asoc->strreset_outstanding &
+		      SCTP_STRRESET_BIT(req->type)))
 		return NULL;
 
 	result = ntohl(resp->result);
@@ -1079,7 +1096,7 @@ struct sctp_chunk *sctp_process_strreset_resp(
 			nums, 0, GFP_ATOMIC);
 	}
 
-	asoc->strreset_outstanding--;
+	asoc->strreset_outstanding &= ~SCTP_STRRESET_BIT(req->type);
 	asoc->strreset_outseq++;
 
 	/* remove everything for this reconf request */
-- 
2.55.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2026-08-21  9:15 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-08-21  9:14 [PATCH net v3 0/2] sctp: handle wrapped and duplicate RECONF responses Jun Yang
2026-08-21  9:14 ` [PATCH net v3 1/2] sctp: distinguish sequence zero from wildcard in reconf lookup Jun Yang
2026-08-21  9:14 ` [PATCH net v3 2/2] sctp: fix stream->outcnt underflow on duplicate RECONF responses Jun Yang

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