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| author | David S. Miller <davem@davemloft.net> | 2018-11-10 19:28:27 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-11-10 19:28:27 -0800 |
| commit | 348bbc25c40844c5efa083a3842c7f53d70a815e (patch) | |
| tree | cea1c8ab0d2ebc06f38790b3f84411281003f29d /net/sctp/stream_interleave.c | |
| parent | 9e733177c71a81ae9be22dbacc79a0dd60a99f21 (diff) | |
| download | lwn-348bbc25c40844c5efa083a3842c7f53d70a815e.tar.gz lwn-348bbc25c40844c5efa083a3842c7f53d70a815e.zip | |
sctp: Fix SKB list traversal in 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.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/net/sctp/stream_interleave.c b/net/sctp/stream_interleave.c index 0a78cdf86463..368d9c33fde1 100644 --- a/net/sctp/stream_interleave.c +++ b/net/sctp/stream_interleave.c @@ -140,7 +140,7 @@ static void sctp_intl_store_reasm(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->reasm); if (!pos) { @@ -166,23 +166,30 @@ static void sctp_intl_store_reasm(struct sctp_ulpq *ulpq, return; } + loc = NULL; skb_queue_walk(&ulpq->reasm, pos) { cevent = sctp_skb2event(pos); if (event->stream < cevent->stream || (event->stream == cevent->stream && - MID_lt(event->mid, cevent->mid))) + MID_lt(event->mid, cevent->mid))) { + loc = pos; break; - + } if (event->stream == cevent->stream && event->mid == cevent->mid && !(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) && (event->msg_flags & SCTP_DATA_FIRST_FRAG || - event->fsn < cevent->fsn)) + event->fsn < cevent->fsn)) { + loc = pos; break; + } } - __skb_queue_before(&ulpq->reasm, pos, sctp_event2skb(event)); + if (!loc) + __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); + else + __skb_queue_before(&ulpq->reasm, loc, sctp_event2skb(event)); } static struct sctp_ulpevent *sctp_intl_retrieve_partial( |