From: "Paul E. McKenney" <paulmck@kernel.org>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com,
rostedt@goodmis.org, Qianfeng Rong <rongqianfeng@vivo.com>,
"Paul E . McKenney" <paulmck@kernel.org>
Subject: [PATCH v2 09/11] refscale: Use kcalloc() instead of kzalloc()
Date: Thu, 18 Sep 2025 03:29:50 -0700 [thread overview]
Message-ID: <20250918102952.2593045-9-paulmck@kernel.org> (raw)
In-Reply-To: <c0edd79a-f988-432c-b08a-18793b2e15d9@paulmck-laptop>
From: Qianfeng Rong <rongqianfeng@vivo.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@vivo.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.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
next prev parent reply other threads:[~2025-09-18 10:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-18 10:29 [PATCH v2 0/11] RCU torture-test updates for v6.18 Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 01/11] rcutorture: Fix jitter.sh spin time Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 02/11] torture: Add --do-normal parameter to torture.sh help text Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 03/11] torture: Announce kernel boot status at torture-test startup Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 04/11] rcutorture: Suppress "Writer stall state" reports during boot Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 05/11] rcutorture: Delay rcutorture readers and writers until boot completes Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 06/11] torture: Delay CPU-hotplug operations " Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 07/11] rcutorture: Delay forward-progress testing " Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 08/11] rcutorture: Use kcalloc() instead of kzalloc() Paul E. McKenney
2025-09-18 10:29 ` Paul E. McKenney [this message]
2025-09-18 10:29 ` [PATCH v2 10/11] refperf: Remove redundant kfree() after torture_stop_kthread() Paul E. McKenney
2025-09-18 10:29 ` [PATCH v2 11/11] refperf: Set reader_tasks to NULL after kfree() Paul E. McKenney
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