In case of TCA_HHF_NON_HH_WEIGHT or TCA_HHF_QUANTUM is zero,
it would make no progress inside the loop in hhf_dequeue() thus
kernel would get stuck.
Fix this by checking this corner case in hhf_change().
Fixes: 10239edf86f1 ("net-qdisc-hhf: Heavy-Hitter Filter (HHF) qdisc")
Reported-by: [email protected]
Reported-by: [email protected]
Reported-by: [email protected]
Cc: Jamal Hadi Salim <[email protected]>
Cc: Jiri Pirko <[email protected]>
Cc: Terry Lam <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
---
net/sched/sch_hhf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sched/sch_hhf.c b/net/sched/sch_hhf.c
index cee6971c1c82..23cd1c873a2c 100644
--- a/net/sched/sch_hhf.c
+++ b/net/sched/sch_hhf.c
@@ -531,7 +531,7 @@ static int hhf_change(struct Qdisc *sch, struct nlattr *opt,
new_hhf_non_hh_weight = nla_get_u32(tb[TCA_HHF_NON_HH_WEIGHT]);
non_hh_quantum = (u64)new_quantum * new_hhf_non_hh_weight;
- if (non_hh_quantum > INT_MAX)
+ if (non_hh_quantum == 0 || non_hh_quantum > INT_MAX)
return -EINVAL;
sch_tree_lock(sch);
--
2.21.0
