Fix for bug #21142: Malformed insert causes a segmentation fault.

  - possible stack overflow fixed.

client/mysql.cc

@@ -2615,7 +2615,7 @@ com_connect(String *buffer, char *line)
   bzero(buff, sizeof(buff));
   if (buffer)
   {
-    strmov(buff, line);
+    strmake(buff, line, sizeof(buff) - 1);
     tmp= get_arg(buff, 0);
     if (tmp && *tmp)
     {
@@ -2729,7 +2729,7 @@ com_use(String *buffer __attribute__((unused)), char *line)
   char *tmp, buff[FN_REFLEN + 1];
 
   bzero(buff, sizeof(buff));
-  strmov(buff, line);
+  strmake(buff, line, sizeof(buff) - 1);
   tmp= get_arg(buff, 0);
   if (!tmp || !*tmp)
   {