4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Xin Long <lucien.xin@xxxxxxxxx>
[ Upstream commit d30fc5126efb0c33b7adf5966d3051db2c3d7721 ]
Now outstanding_bytes is only increased when appending chunks into one
packet and sending it at 1st time, while decreased when it is about to
move into retransmit queue. It means outstanding_bytes value is already
decreased for all chunks in retransmit queue.
However sctp_prsctp_prune_sent is a common function to check the chunks
in both transmitted and retransmit queue, it decrease outstanding_bytes
when moving a chunk into abandoned queue from either of them.
It could cause outstanding_bytes underflow, as it also decreases it's
value for the chunks in retransmit queue.
This patch fixes it by only updating outstanding_bytes for transmitted
queue when pruning queues for prsctp prio policy, the same fix is also
needed in sctp_check_transmitted.
Fixes: 8dbdf1f5b09c ("sctp: implement prsctp PRIO policy")
Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sctp/outqueue.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -364,7 +364,8 @@ static int sctp_prsctp_prune_sent(struct
asoc->sent_cnt_removable--;
asoc->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
- if (!chk->tsn_gap_acked) {
+ if (queue != &asoc->outqueue.retransmit &&
+ !chk->tsn_gap_acked) {
if (chk->transport)
chk->transport->flight_size -=
sctp_data_size(chk);
@@ -1409,7 +1410,8 @@ static void sctp_check_transmitted(struc
/* If this chunk has not been acked, stop
* considering it as 'outstanding'.
*/
- if (!tchunk->tsn_gap_acked) {
+ if (transmitted_queue != &q->retransmit &&
+ !tchunk->tsn_gap_acked) {
if (tchunk->transport)
tchunk->transport->flight_size -=
sctp_data_size(tchunk);