[PATCH v2 4/4] MdeModulePkg/SetupBrowserDxe: Add check for GetBufferForValue()

["Zhang, Shenglei" <shenglei.zhang@intel.com>]

The returned value from GetBufferForValue might be NULL, so add a
check for that before it is used.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
---
 MdeModulePkg/Universal/SetupBrowserDxe/Expression.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c b/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c
index 7f4929c2fcd9..984c68c6bb7a 100644
--- a/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c
+++ b/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c
@@ -1281,7 +1281,12 @@ IfrToUint (
       Result->Type = EFI_IFR_TYPE_UNDEFINED;
       return EFI_SUCCESS;
     }
+
+    if (GetBufferForValue (&Value) == NULL) {
+      return EFI_NOT_FOUND;
+    } 
     Result->Value.u64 = *(UINT64*) GetBufferForValue (&Value);
+
     if (Value.Type == EFI_IFR_TYPE_BUFFER) {
       FreePool (Value.Buffer);
     }
-- 
2.18.0.windows.1