linux-kernel - [PATCH v2 5/6] time: Use copy_from_user_nul() instead of copy_from

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Message-Id: <20260112073039.1185-6-fushuai.wang@linux.dev>
Date: Mon, 12 Jan 2026 15:30:38 +0800
From: Fushuai Wang <fushuai.wang@...ux.dev>
To: tglx@...nel.org,
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Cc: linux-kernel@...r.kernel.org,
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Subject: [PATCH v2 5/6] time: Use copy_from_user_nul() instead of copy_from_user()

From: Fushuai Wang <wangfushuai@...du.com>

Use copy_from_user_nul() instead of copy_from_user() to simplify
the code.

No functional change.

Signed-off-by: Fushuai Wang <wangfushuai@...du.com>
---
 kernel/time/test_udelay.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/time/test_udelay.c b/kernel/time/test_udelay.c
index 783f2297111b..08ff8fd43471 100644
--- a/kernel/time/test_udelay.c
+++ b/kernel/time/test_udelay.c
@@ -107,9 +107,8 @@ static ssize_t udelay_test_write(struct file *file, const char __user *buf,
 	if (count >= sizeof(lbuf))
 		return -EINVAL;
 
-	if (copy_from_user(lbuf, buf, count))
+	if (copy_from_user_nul(lbuf, buf, count))
 		return -EFAULT;
-	lbuf[count] = '\0';
 
 	ret = sscanf(lbuf, "%d %d", &usecs, &iters);
 	if (ret < 1)
-- 
2.36.1