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Message-Id: <20260112073039.1185-3-fushuai.wang@linux.dev> Date: Mon, 12 Jan 2026 15:30:35 +0800 From: Fushuai Wang <fushuai.wang@...ux.dev> To: tglx@...nel.org, peterz@...radead.org, mathieu.desnoyers@...icios.com, akpm@...ux-foundation.org, aliceryhl@...gle.com, yury.norov@...il.com, vmalik@...hat.com, kees@...nel.org, dave.hansen@...ux.intel.com, luto@...nel.org, mingo@...hat.com, bp@...en8.de, hpa@...or.com, rostedt@...dmis.org, mhiramat@...nel.org, brauner@...nel.org, jack@...e.cz, cyphar@...har.com Cc: linux-kernel@...r.kernel.org, x86@...nel.org, linux-trace-kernel@...r.kernel.org, wangfushuai@...du.com Subject: [PATCH v2 2/6] x86/tlb: 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> --- 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
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