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authorDavid S. Miller <davem@davemloft.net>2018-11-11 06:32:23 +0300
committerDavid S. Miller <davem@davemloft.net>2018-11-11 06:32:23 +0300
commite15e067d0656625c77c52b4e5f0cfbf0c0c3583f (patch)
treed06dda58359ade7f684f10eb696a99ff56126cda /net/sctp/stream_interleave.c
parent348bbc25c40844c5efa083a3842c7f53d70a815e (diff)
downloadlinux-e15e067d0656625c77c52b4e5f0cfbf0c0c3583f.tar.xz
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@davemloft.net>
Diffstat (limited to 'net/sctp/stream_interleave.c')
-rw-r--r--net/sctp/stream_interleave.c17
1 files 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,