netdev - [PATCH net-next] sctp: Fix SKB list traversal in sctp_intl_store

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Date:   Sat, 10 Nov 2018 19:32:56 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     netdev@...r.kernel.org
Subject: [PATCH net-next] sctp: Fix SKB list traversal in
 sctp_intl_store_ordered().


Same change as made to sctp_intl_store_reasm().

To be fully correct, an iterator has an undefined value when something
like skb_queue_walk() naturally terminates.

This will actually matter when SKB queues are converted over to
list_head.

Formalize what this code ends up doing with the current
implementation.

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/sctp/stream_interleave.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/net/sctp/stream_interleave.c b/net/sctp/stream_interleave.c
index 368d9c33fde1..2b499a85db0e 100644
--- a/net/sctp/stream_interleave.c
+++ b/net/sctp/stream_interleave.c
@@ -390,7 +390,7 @@ static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq,
 				    struct sctp_ulpevent *event)
 {
 	struct sctp_ulpevent *cevent;
-	struct sk_buff *pos;
+	struct sk_buff *pos, *loc;
 
 	pos = skb_peek_tail(&ulpq->lobby);
 	if (!pos) {
@@ -410,18 +410,25 @@ static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq,
 		return;
 	}
 
+	loc = NULL;
 	skb_queue_walk(&ulpq->lobby, pos) {
 		cevent = (struct sctp_ulpevent *)pos->cb;
 
-		if (cevent->stream > event->stream)
+		if (cevent->stream > event->stream) {
+			loc = pos;
 			break;
-
+		}
 		if (cevent->stream == event->stream &&
-		    MID_lt(event->mid, cevent->mid))
+		    MID_lt(event->mid, cevent->mid)) {
+			loc = pos;
 			break;
+		}
 	}
 
-	__skb_queue_before(&ulpq->lobby, pos, sctp_event2skb(event));
+	if (!loc)
+		__skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
+	else
+		__skb_queue_before(&ulpq->lobby, loc, sctp_event2skb(event));
 }
 
 static void sctp_intl_retrieve_ordered(struct sctp_ulpq *ulpq,
-- 
2.19.1