From 1ea1c8fc7bacd167c3041ab088dba031dca456b4 Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Wed, 27 Mar 2024 18:39:40 -0400
Subject: [PATCH] [msh] solve data access bugs and fix shell.c strcat()

When using musl libc's strcat, strcat itself will cause system crash.
---
 components/finsh/shell.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index b21b314525..e698edd51f 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -112,7 +112,11 @@ const char *finsh_get_prompt(void)
     getcwd(&finsh_prompt[rt_strlen(finsh_prompt)], RT_CONSOLEBUF_SIZE - rt_strlen(finsh_prompt));
 #endif
 
-    strcat(finsh_prompt, ">");
+    if (rt_strlen(finsh_prompt) + 2 < RT_CONSOLEBUF_SIZE)
+    {
+        finsh_prompt[rt_strlen(finsh_prompt)] = '>';
+        finsh_prompt[rt_strlen(finsh_prompt) + 1] = '\0';
+    }
 
     return finsh_prompt;
 }