linux-kernel - [PATCH] thermal: genetlink: Fix TZ_GET

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Message-Id: <20220228110351.20518-2-nicolas.cavallari@green-communications.fr>
Date:   Mon, 28 Feb 2022 12:03:51 +0100
From:   Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] thermal: genetlink: Fix TZ_GET_TRIP NULL pointer dereference

Do not call get_trip_hyst() if the thermal zone does not define one.

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>
---
 drivers/thermal/thermal_netlink.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c
index a16dd4d5d710..73e68cce292e 100644
--- a/drivers/thermal/thermal_netlink.c
+++ b/drivers/thermal/thermal_netlink.c
@@ -419,11 +419,12 @@ static int thermal_genl_cmd_tz_get_trip(struct param *p)
 	for (i = 0; i < tz->trips; i++) {
 
 		enum thermal_trip_type type;
-		int temp, hyst;
+		int temp, hyst = 0;
 
 		tz->ops->get_trip_type(tz, i, &type);
 		tz->ops->get_trip_temp(tz, i, &temp);
-		tz->ops->get_trip_hyst(tz, i, &hyst);
+		if (tz->ops->get_trip_hyst)
+			tz->ops->get_trip_hyst(tz, i, &hyst);
 
 		if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, i) ||
 		    nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, type) ||
-- 
2.35.1