[PATCH 3/7] MdeModulePkg NvmExpressDxe: Refine GetNameSpace API to follow spec

[Hao Wu <hao.a.wu@intel.com>]

According to the UEFI spec,
EFI_NVM_EXPRESS_PASS_THRU_PROTOCOL.GetNamespace() should return
EFI_NOT_FOUND when the input DevicePath is a device path node type that
the NVM Express Pass Thru driver supports, but there is not a valid
translation from DevicePath to a namespace ID. Current code will return
EFI_SUCCESS. This commit adds additional check in the GetNameSpace API to
make sure correct status is returned.

Cc: Feng Tian <feng.tian@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
---
 MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
index ccff4f6..f0d2f5a 100644
--- a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
+++ b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
@@ -820,6 +820,7 @@ NvmExpressGetNamespace (
   )
 {
   NVME_NAMESPACE_DEVICE_PATH       *Node;
+  NVME_CONTROLLER_PRIVATE_DATA     *Private;
 
   if ((This == NULL) || (DevicePath == NULL) || (NamespaceId == NULL)) {
     return EFI_INVALID_PARAMETER;
@@ -829,13 +830,22 @@ NvmExpressGetNamespace (
     return EFI_UNSUPPORTED;
   }
 
-  Node = (NVME_NAMESPACE_DEVICE_PATH *)DevicePath;
+  Node    = (NVME_NAMESPACE_DEVICE_PATH *)DevicePath;
+  Private = NVME_CONTROLLER_PRIVATE_DATA_FROM_PASS_THRU (This);
 
   if (DevicePath->SubType == MSG_NVME_NAMESPACE_DP) {
     if (DevicePathNodeLength(DevicePath) != sizeof(NVME_NAMESPACE_DEVICE_PATH)) {
       return EFI_NOT_FOUND;
     }
 
+    //
+    // Check NamespaceId in the device path node is valid or not.
+    //
+    if ((Node->NamespaceId == 0) ||
+      (Node->NamespaceId > Private->ControllerData->Nn)) {
+      return EFI_NOT_FOUND;
+    }
+
     *NamespaceId = Node->NamespaceId;
 
     return EFI_SUCCESS;
-- 
1.9.5.msysgit.0