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BUG/MINOR: quic: Cubic congestion control window may wrap

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Add a check to prevent the cubic congestion control from wrapping (very low risk)
in slow start callback.

Must be backported to 2.6 and 2.7.
This commit is contained in:
Frédéric Lécaille 2023-04-02 10:07:48 +02:00
parent 23b8eef05b
commit db54847212
1 changed files with 2 additions and 1 deletions
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src/quic_cc_cubic.c
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@ -203,6 +203,7 @@ static void quic_cc_cubic_ss_cb(struct quic_cc *cc, struct quic_cc_event *ev)
TRACE_PROTO("CC cubic", QUIC_EV_CONN_CC, cc->qc, ev); TRACE_PROTO("CC cubic", QUIC_EV_CONN_CC, cc->qc, ev);
switch (ev->type) { switch (ev->type) {
case QUIC_CC_EVT_ACK: case QUIC_CC_EVT_ACK:
if (path->cwnd < QUIC_CC_INFINITE_SSTHESH - ev->ack.acked)
path->cwnd += ev->ack.acked; path->cwnd += ev->ack.acked;
/* Exit to congestion avoidance if slow start threshold is reached. */ /* Exit to congestion avoidance if slow start threshold is reached. */
if (path->cwnd >= c->ssthresh) if (path->cwnd >= c->ssthresh)