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authorLee A. Roberts <lee.roberts@hp.com>2013-02-28 08:37:29 +0400
committerDavid S. Miller <davem@davemloft.net>2013-03-01 00:34:26 +0400
commit95ac7b859f508b1b3e6adf7dce307864e4384a69 (patch)
tree5e1c0cad931d5440c0434da15ef52ed2eaf002ab /net/sctp
parente67f85ecd83de66d4f25f2e0f90bb0d01a52ddd8 (diff)
downloadlinux-95ac7b859f508b1b3e6adf7dce307864e4384a69.tar.xz
sctp: fix association hangs due to errors when reneging events from the ordering queue
In sctp_ulpq_renege_list(), events being reneged from the ordering queue may correspond to multiple TSNs. Identify all affected packets; sum freed space and renege from the tsnmap. Signed-off-by: Lee A. Roberts <lee.roberts@hp.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/ulpqueue.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index 63afddcbcd2c..f221fbbc80ac 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -962,8 +962,8 @@ static __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
struct sk_buff_head *list, __u16 needed)
{
__u16 freed = 0;
- __u32 tsn;
- struct sk_buff *skb;
+ __u32 tsn, last_tsn;
+ struct sk_buff *skb, *flist, *last;
struct sctp_ulpevent *event;
struct sctp_tsnmap *tsnmap;
@@ -977,10 +977,28 @@ static __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
break;
- __skb_unlink(skb, list);
+ /* Events in ordering queue may have multiple fragments
+ * corresponding to additional TSNs. Sum the total
+ * freed space; find the last TSN.
+ */
freed += skb_headlen(skb);
+ flist = skb_shinfo(skb)->frag_list;
+ for (last = flist; flist; flist = flist->next) {
+ last = flist;
+ freed += skb_headlen(last);
+ }
+ if (last)
+ last_tsn = sctp_skb2event(last)->tsn;
+ else
+ last_tsn = tsn;
+
+ /* Unlink the event, then renege all applicable TSNs. */
+ __skb_unlink(skb, list);
sctp_ulpevent_free(event);
- sctp_tsnmap_renege(tsnmap, tsn);
+ while (TSN_lte(tsn, last_tsn)) {
+ sctp_tsnmap_renege(tsnmap, tsn);
+ tsn++;
+ }
if (freed >= needed)
return freed;
}