sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
[ Upstream commit d4d6ec6dac07f263f06d847d6f732d6855522845 ] 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: 10239edf ("net-qdisc-hhf: Heavy-Hitter Filter (HHF) qdisc") Reported-by: syzbot+bc6297c11f19ee807dc2@syzkaller.appspotmail.com Reported-by: syzbot+041483004a7f45f1f20a@syzkaller.appspotmail.com Reported-by: syzbot+55be5f513bed37fc4367@syzkaller.appspotmail.com Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Cc: Terry Lam <vtlam@google.com> Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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