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Commit 575464db authored by Joonwoo Park's avatar Joonwoo Park Committed by Gerrit - the friendly Code Review server
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sched: prevent out of bound access in sched_group_energy() 



group_idle_state() can return INT_MAX + 1 which is undefined behaviour
when there is no CPUs in sched_group.  Prevent such by error correctly.

Change-Id: I236a90b9725edc2f394ade6533368f5d4b1a21d2
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent dc0a96e6

kernel/sched/fair.c

+3 −0
Original line number Diff line number Diff line
@@ -5765,6 +5765,9 @@ static int group_idle_state(struct energy_env *eenv, int cpu_idx) 
	for_each_cpu(i, sched_group_span(sg))

		state = min(state, idle_get_state_idx(cpu_rq(i)));



	if (unlikely(state == INT_MAX))

		return -EINVAL;



	/* Take non-cpuidle idling into account (active idle/arch_cpu_idle()) */

	state++;

	/*