[PATCH v2 2/6] x86/tlb: Use copy_from_user_nul() instead of copy_from_user()

[Fushuai Wang <fushuai.wang@linux.dev>]

From: Fushuai Wang <wangfushuai@baidu.com>

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

No functional change.

Signed-off-by: Fushuai Wang <wangfushuai@baidu.com>
---
 arch/x86/mm/tlb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index f5b93e01e347..ae81e5cb510e 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1807,10 +1807,9 @@ static ssize_t tlbflush_write_file(struct file *file,
 	int ceiling;
 
 	len = min(count, sizeof(buf) - 1);
-	if (copy_from_user(buf, user_buf, len))
+	if (copy_from_user_nul(buf, user_buf, len))
 		return -EFAULT;
 
-	buf[len] = '\0';
 	if (kstrtoint(buf, 0, &ceiling))
 		return -EINVAL;
 
-- 
2.36.1