linux-kernel - [PATCH] thermal: core: Use strnlen in thermal_zone_device_register_with

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Message-ID: <20251215121633.375193-1-thorsten.blum@linux.dev>
Date: Mon, 15 Dec 2025 13:16:33 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Lukasz Luba <lukasz.luba@....com>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] thermal: core: Use strnlen in thermal_zone_device_register_with_trips

Replace strlen() with the safer strnlen() and calculate the length of
the thermal zone name 'type' only once.  No functional changes.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 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 17ca5c082643..63eb35b449c6 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1505,15 +1505,17 @@ thermal_zone_device_register_with_trips(const char *type,
 	const struct thermal_trip *trip = trips;
 	struct thermal_zone_device *tz;
 	struct thermal_trip_desc *td;
+	size_t type_len;
 	int id;
 	int result;
 
-	if (!type || strlen(type) == 0) {
+	type_len = type ? strnlen(type, THERMAL_NAME_LENGTH) : 0;
+	if (type_len == 0) {
 		pr_err("No thermal zone type defined\n");
 		return ERR_PTR(-EINVAL);
 	}
 
-	if (strlen(type) >= THERMAL_NAME_LENGTH) {
+	if (type_len == THERMAL_NAME_LENGTH) {
 		pr_err("Thermal zone name (%s) too long, should be under %d chars\n",
 		       type, THERMAL_NAME_LENGTH);
 		return ERR_PTR(-EINVAL);
-- 
Thorsten Blum <thorsten.blum@...ux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4