From: Lee A. Roberts <lee.roberts@hp.com>
Date: Thu, 28 Feb 2013 04:37:28 +0000 (+0000)
Subject: sctp: fix association hangs due to reneging packets below the cumulative TSN ACK... 
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e67f85ecd83de66d4f25f2e0f90bb0d01a52ddd8;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

sctp: fix association hangs due to reneging packets below the cumulative TSN ACK point

In sctp_ulpq_renege_list(), do not renege packets below the
cumulative TSN ACK point.

Signed-off-by: Lee A. Roberts <lee.roberts@hp.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
---

diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index ada17464b65..63afddcbcd2 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -969,11 +969,16 @@ static __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
 
 	tsnmap = &ulpq->asoc->peer.tsn_map;
 
-	while ((skb = __skb_dequeue_tail(list)) != NULL) {
-		freed += skb_headlen(skb);
+	while ((skb = skb_peek_tail(list)) != NULL) {
 		event = sctp_skb2event(skb);
 		tsn = event->tsn;
 
+		/* Don't renege below the Cumulative TSN ACK Point. */
+		if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
+			break;
+
+		__skb_unlink(skb, list);
+		freed += skb_headlen(skb);
 		sctp_ulpevent_free(event);
 		sctp_tsnmap_renege(tsnmap, tsn);
 		if (freed >= needed)