linux-kernel - [PATCH] thermal/debugfs: replace kzalloc() with kcalloc() in thermal_debug_tz

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Message-Id: <20250222-thermal_kcalloc-v1-1-9f7a747fbed7@ethancedwards.com>
Date: Sat, 22 Feb 2025 15:02:42 -0500
From: Ethan Carter Edwards <ethan@...ancedwards.com>
To: Markus Elfring <Markus.Elfring@....de>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>, 
 Lukasz Luba <lukasz.luba@....com>, linux-pm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, 
 Ethan Carter Edwards <ethan@...ancedwards.com>
Subject: [PATCH] thermal/debugfs: replace kzalloc() with kcalloc() in
 thermal_debug_tz_add()

We are trying to get rid of all multiplications from allocation
functions to prevent integer overflows[1]. Here the multiplication is
obviously safe, but using kcalloc() is more appropriate and improves
readability. This patch has no effect on runtime behavior.

Link: https://github.com/KSPP/linux/issues/162 [1]
Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Ethan Carter Edwards <ethan@...ancedwards.com>
---
 drivers/thermal/thermal_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/thermal_debugfs.c b/drivers/thermal/thermal_debugfs.c
index c800504c3cfe0ea3b4a51286f348dd5802e1898f..60ee6c366998e26447a0b985112f578ba8757f17 100644
--- a/drivers/thermal/thermal_debugfs.c
+++ b/drivers/thermal/thermal_debugfs.c
@@ -876,7 +876,7 @@ void thermal_debug_tz_add(struct thermal_zone_device *tz)

 	tz_dbg->tz = tz;

-	tz_dbg->trips_crossed = kzalloc(sizeof(int) * tz->num_trips, GFP_KERNEL);
+	tz_dbg->trips_crossed = kcalloc(tz->num_trips, sizeof(int), GFP_KERNEL);
 	if (!tz_dbg->trips_crossed) {
 		thermal_debugfs_remove_id(thermal_dbg);
 		return;

---
base-commit: 5cf80612d3f72c46ad53ef5042b4c609c393122f
change-id: 20250222-thermal_kcalloc-881dcf5b77b8

Best regards,
-- 
Ethan Carter Edwards <ethan@...ancedwards.com>