[patch] ShellPkg: Add the check of parameter number in "DrvCfg" command

[Dandan Bi <dandan.bi@intel.com>]

In shell spec, the usage of "Drvcfg" command is: drvcfg [-l XXX] [-c]
[-f <Type>|-v|-s] [DriverHandle [DeviceHandle [ChildHandle]]]
[-i filename] [-o filename]. The parameter number(doesn't include the flags)
cannot exceed 4, now we add this point to check whether using the command
correctly.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 ShellPkg/Library/UefiShellDriver1CommandsLib/DrvCfg.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ShellPkg/Library/UefiShellDriver1CommandsLib/DrvCfg.c b/ShellPkg/Library/UefiShellDriver1CommandsLib/DrvCfg.c
index 0d12f01..cc1c9ca 100644
--- a/ShellPkg/Library/UefiShellDriver1CommandsLib/DrvCfg.c
+++ b/ShellPkg/Library/UefiShellDriver1CommandsLib/DrvCfg.c
@@ -1210,10 +1210,15 @@ ShellCommandRunDrvCfg (
         ASSERT(FALSE);
       }
     }
   } 
   if (ShellStatus == SHELL_SUCCESS) {
+    if (ShellCommandLineGetCount(Package) > 4) {
+      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDriver1HiiHandle, L"drvcfg");
+      ShellStatus = SHELL_INVALID_PARAMETER;
+      goto Done;
+    }
     Lang = ShellCommandLineGetValue(Package, L"-l");
     if (Lang != NULL) {
       Language = AllocateZeroPool(StrSize(Lang));
       AsciiSPrint(Language, StrSize(Lang), "%S", Lang);
     } else if (ShellCommandLineGetFlag(Package, L"-l")){
-- 
1.9.5.msysgit.1