From 14e048aa8e7cfd292d44aad762328b59dee53495 Mon Sep 17 00:00:00 2001
From: misonyo <misonyo@foxmail.com>
Date: Wed, 13 Mar 2019 22:05:03 +0800
Subject: [PATCH] [components/shell] shell will not work if ch is none zero as
 random value in stack

The serial getchar will only modify the LSB of ch, the MSB 3 bytes
will be unchanged as the random value on stack, so if MSB 3 bytes
not zero, the value got is wrong.
---
 components/finsh/shell.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index 61c8d3dd15..1033e2c998 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -139,7 +139,7 @@ static int finsh_getchar(void)
 #ifdef RT_USING_POSIX
     return getchar();
 #else
-    int ch;
+    int ch = 0;
 
     RT_ASSERT(shell != RT_NULL);
     while (rt_device_read(shell->device, -1, &ch, 1) != 1)