From: Qianfeng Rong <rongqianfeng@vivo.com>
Date: Thu, 21 Aug 2025 13:41:16 +0000 (+0800)
Subject: rcutorture: Use kcalloc() instead of kzalloc()
X-Git-Tag: v6.18-rc1~86^2^2~3
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3e15cccf3ea272ae40942e8a5a741bb69a56f654;p=thirdparty%2Fkernel%2Flinux.git

rcutorture: Use kcalloc() instead of kzalloc()

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

Change sizeof(ulo[0]) and sizeof(rgo[0]) to sizeof(*ulo) and sizeof(*rgo),
as this is more consistent with coding conventions.

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index b8a684459381..29fe3c01312f 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1572,12 +1572,12 @@ rcu_torture_writer(void *arg)
 		return 0;
 	}
 	if (cur_ops->poll_active > 0) {
-		ulo = kzalloc(cur_ops->poll_active * sizeof(ulo[0]), GFP_KERNEL);
+		ulo = kcalloc(cur_ops->poll_active, sizeof(*ulo), GFP_KERNEL);
 		if (!WARN_ON(!ulo))
 			ulo_size = cur_ops->poll_active;
 	}
 	if (cur_ops->poll_active_full > 0) {
-		rgo = kzalloc(cur_ops->poll_active_full * sizeof(rgo[0]), GFP_KERNEL);
+		rgo = kcalloc(cur_ops->poll_active_full, sizeof(*rgo), GFP_KERNEL);
 		if (!WARN_ON(!rgo))
 			rgo_size = cur_ops->poll_active_full;
 	}