[finsh]Fixed a bug may cause stackover flow
add code:
if (line_buf == RT_NULL) return -RT_ENOMEM;
@@ -101,6 +101,7 @@ int msh_exec_script(const char *cmd_line, int size)
int length;
line_buf = (char *) rt_malloc(RT_CONSOLEBUF_SIZE);
+ if (line_buf == RT_NULL) return -RT_ENOMEM;
/* read line by line and then exec it */
do
