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..6b8adfbf9c2d 100644
--- a/net/sched/act_gate.c
+++ b/net/sched/act_gate.c
@@ -178,6 +178,10 @@ static const struct nla_policy gate_policy[TCA_GATE_MAX + 1] = {
 	[TCA_GATE_CLOCKID]		= { .type = NLA_S32 },
 };
 
+#ifndef __NET_TC_GATE_LIMIT
+#define GATE_ENTRY_INTERVAL_MIN 100
+#endif
+
 static int fill_gate_entry(struct nlattr **tb, struct tcfg_gate_entry *entry,
 			   struct netlink_ext_ack *extack)
 {
@@ -188,7 +192,7 @@ static int fill_gate_entry(struct nlattr **tb, struct tcfg_gate_entry *entry,
 	if (tb[TCA_GATE_ENTRY_INTERVAL])
 		interval = nla_get_u32(tb[TCA_GATE_ENTRY_INTERVAL]);
 
-	if (interval == 0) {
+	if (interval < GATE_ENTRY_INTERVAL_MIN) {
 		NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
 		return -EINVAL;
 	}