linux-kernel - [PATCH 5.4 034/222] cpuidle: teo: Fix intervals[] array indexing bug

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Date:   Wed, 22 Jan 2020 10:27:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ikjoon Jang <ikjn@...omium.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.4 034/222] cpuidle: teo: Fix intervals[] array indexing bug

From: Ikjoon Jang <ikjn@...omium.org>

commit 57388a2ccb6c2f554fee39772886c69b796dde53 upstream.

Fix a simple bug in rotating array index.

Fixes: b26bf6ab716f ("cpuidle: New timer events oriented governor for tickless systems")
Signed-off-by: Ikjoon Jang <ikjn@...omium.org>
Cc: 5.1+ <stable@...r.kernel.org> # 5.1+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/cpuidle/governors/teo.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cpuidle/governors/teo.c
+++ b/drivers/cpuidle/governors/teo.c
@@ -194,7 +194,7 @@ static void teo_update(struct cpuidle_dr
 	 * pattern detection.
 	 */
 	cpu_data->intervals[cpu_data->interval_idx++] = measured_us;
-	if (cpu_data->interval_idx > INTERVALS)
+	if (cpu_data->interval_idx >= INTERVALS)
 		cpu_data->interval_idx = 0;
 }