linux-kernel - [PATCH v2 09/11] refscale: Use kcalloc() instead of kzalloc()

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Message-Id: <20250918102952.2593045-9-paulmck@kernel.org>
Date: Thu, 18 Sep 2025 03:29:50 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	Qianfeng Rong <rongqianfeng@...o.com>,
	"Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v2 09/11] refscale: Use kcalloc() instead of kzalloc()

From: Qianfeng Rong <rongqianfeng@...o.com>

Use kcalloc() in main_func() to gain built-in overflow protection, making
memory allocation safer when calculating allocation size compared to
explicit multiplication.

Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/refscale.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index df646e0694a8cc..5840fac06feb7d 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -1021,7 +1021,7 @@ static int main_func(void *arg)
 	set_user_nice(current, MAX_NICE);
 
 	VERBOSE_SCALEOUT("main_func task started");
-	result_avg = kzalloc(nruns * sizeof(*result_avg), GFP_KERNEL);
+	result_avg = kcalloc(nruns, sizeof(*result_avg), GFP_KERNEL);
 	buf = kzalloc(800 + 64, GFP_KERNEL);
 	if (!result_avg || !buf) {
 		SCALEOUT_ERRSTRING("out of memory");
-- 
2.40.1