From 1d239db59e58e0439d9f4fc61de44221bf5d9535 Mon Sep 17 00:00:00 2001
From: goldengrandpa <74250839+guoguozi123456@users.noreply.github.com>
Date: Fri, 9 Jun 2023 09:09:50 +0800
Subject: [PATCH] =?UTF-8?q?[tty]=E4=BF=AE=E5=A4=8D=E5=A4=9A=E6=AC=A1scanf?=
 =?UTF-8?q?=E4=B9=8B=E5=90=8E,=E5=AF=BC=E8=87=B4=E4=B8=A2=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE=E7=9A=84=E9=97=AE=E9=A2=98=20(#7640)?=
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---
 components/drivers/tty/n_tty.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/components/drivers/tty/n_tty.c b/components/drivers/tty/n_tty.c
index 5ed7d6a6f8..8b6d1d089f 100644
--- a/components/drivers/tty/n_tty.c
+++ b/components/drivers/tty/n_tty.c
@@ -1436,14 +1436,15 @@ static int canon_copy_from_read_buf(struct tty_struct *tty, char *b, size_t nr)
 
     size_t buf_size = RT_TTY_BUF - tail;
     const void *from = read_buf_addr(ldata, tail);
+    size_t temp_n = n;
     if (n > buf_size)
     {
         rt_memcpy(b, from, buf_size);
         b += buf_size;
-        n -= buf_size;
+        temp_n -= buf_size;
         from = ldata->read_buf;
     }
-    rt_memcpy(b, from, n);
+    rt_memcpy(b, from, temp_n);
 
     if (found)
     {
-- 
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