Re: [syzbot] [kernel?] BUG: soft lockup in gate_timer_func

[Edward Adam Davis]

#syz test

diff --git a/net/sched/act_gate.c b/net/sched/act_gate.c
index fdbfcaa3e2ab..9065e7b88156 100644
--- a/net/sched/act_gate.c
+++ b/net/sched/act_gate.c
@@ -88,7 +88,8 @@ static enum hrtimer_restart gate_timer_func(struct hrtimer *timer)
 	gact->current_max_octets = next->maxoctets;
 
 	gact->current_close_time = ktime_add_ns(gact->current_close_time,
-						next->interval);
+						next->interval < 100 ?
+						100 : next->interval);
 
 	close_time = gact->current_close_time;
 
@@ -101,10 +102,10 @@ static enum hrtimer_restart gate_timer_func(struct hrtimer *timer)
 	now = gate_get_time(gact);
 
 	if (ktime_after(now, close_time)) {
-		ktime_t cycle, base;
+		u64 cycle, base;
 		u64 n;
 
-		cycle = p->tcfg_cycletime;
+		cycle = p->tcfg_cycletime > 20 ? 20 : p->tcfg_cycletime;
 		base = ns_to_ktime(p->tcfg_basetime);
 		n = div64_u64(ktime_sub_ns(now, base), cycle);
 		close_time = ktime_add_ns(base, (n + 1) * cycle);