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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-01-02 05:47:57 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-01-03 12:58:23 -0500 |
| commit | 6bafcac3238758203703bdd4abe9c1f38d259584 (patch) | |
| tree | b5413ecd31f0fa3229b04bd415c870041fe30d95 /net/sched/sch_qfq.c | |
| parent | 115e8e705e4be071b9e06ff72578e3b603f2ba65 (diff) | |
| download | linux-6bafcac3238758203703bdd4abe9c1f38d259584.tar.gz | |
sch_qfq: fix overflow in qfq_update_start()
grp->slot_shift is between 22 and 41, so using 32bit wide variables is probably a typo. This could explain QFQ hangs Dave reported to me, after 2^23 packets ? (23 = 64 - 41) Reported-by: Dave Taht <dave.taht@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Stephen Hemminger <shemminger@vyatta.com> CC: Dave Taht <dave.taht@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_qfq.c')
| -rw-r--r-- | net/sched/sch_qfq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c index 103343408593..7b0325459e71 100644 --- a/net/sched/sch_qfq.c +++ b/net/sched/sch_qfq.c @@ -817,11 +817,11 @@ skip_unblock: static void qfq_update_start(struct qfq_sched *q, struct qfq_class *cl) { unsigned long mask; - uint32_t limit, roundedF; + u64 limit, roundedF; int slot_shift = cl->grp->slot_shift; roundedF = qfq_round_down(cl->F, slot_shift); - limit = qfq_round_down(q->V, slot_shift) + (1UL << slot_shift); + limit = qfq_round_down(q->V, slot_shift) + (1ULL << slot_shift); if (!qfq_gt(cl->F, q->V) || qfq_gt(roundedF, limit)) { /* timestamp was stale */ |