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

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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>
This commit is contained in:
Lee A. Roberts 2013-02-28 04:37:28 +00:00 committed by David S. Miller
parent 70fc69bc5a
commit e67f85ecd8
1 changed files with 7 additions and 2 deletions
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9
net/sctp/ulpqueue.c
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@ -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)