diff options
| author | Kenneth Klette Jonassen <kennetkl@ifi.uio.no> | 2015-02-03 17:49:18 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2020-04-28 19:03:17 +0100 |
| commit | 3facfec87efad82083061633190d06552348fa24 (patch) | |
| tree | 5e90350815444bbf3f9ecb18e129b73c4accfcab /net | |
| parent | 43261ab1e5b88426774b0b35557088e231ce4e4b (diff) | |
| download | linux-stable-3facfec87efad82083061633190d06552348fa24.tar.gz linux-stable-3facfec87efad82083061633190d06552348fa24.tar.bz2 linux-stable-3facfec87efad82083061633190d06552348fa24.zip | |
pkt_sched: fq: avoid hang when quantum 0
commit 3725a269815ba6dbb415feddc47da5af7d1fac58 upstream.
Configuring fq with quantum 0 hangs the system, presumably because of a
non-interruptible infinite loop. Either way quantum 0 does not make sense.
Reproduce with:
sudo tc qdisc add dev lo root fq quantum 0 initial_quantum 0
ping 127.0.0.1
Signed-off-by: Kenneth Klette Jonassen <kennetkl@ifi.uio.no>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_fq.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c index da3621feae74..a985588695df 100644 --- a/net/sched/sch_fq.c +++ b/net/sched/sch_fq.c @@ -687,8 +687,14 @@ static int fq_change(struct Qdisc *sch, struct nlattr *opt) if (tb[TCA_FQ_FLOW_PLIMIT]) q->flow_plimit = nla_get_u32(tb[TCA_FQ_FLOW_PLIMIT]); - if (tb[TCA_FQ_QUANTUM]) - q->quantum = nla_get_u32(tb[TCA_FQ_QUANTUM]); + if (tb[TCA_FQ_QUANTUM]) { + u32 quantum = nla_get_u32(tb[TCA_FQ_QUANTUM]); + + if (quantum > 0) + q->quantum = quantum; + else + err = -EINVAL; + } if (tb[TCA_FQ_INITIAL_QUANTUM]) q->initial_quantum = nla_get_u32(tb[TCA_FQ_INITIAL_QUANTUM]); |