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net: sched: tapr: prevent cycle_time == 0 in parse_taprio_schedule
[ Upstream commit ed8157f ] There is a reproducible sequence from the userland that will trigger a WARN_ON() condition in taprio_get_start_time, which causes kernel to panic if configured as "panic_on_warn". Catch this condition in parse_taprio_schedule to prevent this condition. Reported as bug on syzkaller: https://syzkaller.appspot.com/bug?extid=d50710fd0873a9c6b40c Reported-by: syzbot+d50710fd0873a9c6b40c@syzkaller.appspotmail.com Signed-off-by: Du Cheng <ducheng2@gmail.com> Acked-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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