linux-kernel - [PATCH 3/3] thermal: core: fix: Check return code of the ->get_max

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Date:	Wed, 24 Sep 2014 10:27:12 +0200
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	linux-kernel@...r.kernel.org,
	Lukasz Majewski <l.majewski@...sung.com>
Subject: [PATCH 3/3] thermal: core: fix: Check return code of the
 ->get_max_state() callback

Without this check it was possible to execute cooling device binding code
even when wrong max cooling state was read.

Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
---
 drivers/thermal/thermal_core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 747618a..8a4dc35 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -928,7 +928,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 	struct thermal_zone_device *pos1;
 	struct thermal_cooling_device *pos2;
 	unsigned long max_state = 0;
-	int result;
+	int result, ret;
 
 	if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 		return -EINVAL;
@@ -945,7 +945,9 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 	if (tz != pos1 || cdev != pos2)
 		return -EINVAL;
 
-	cdev->ops->get_max_state(cdev, &max_state);
+	ret = cdev->ops->get_max_state(cdev, &max_state);
+	if (ret)
+		return ret;
 
 	/* lower default 0, upper default max_state */
 	lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
-- 
2.0.0.rc2

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