--- /dev/null
+/** @file\r
+ Supports Capsule Dependency Expression.\r
+\r
+ Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>\r
+\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
+\r
+**/\r
+#include "FmpDxe.h"\r
+#include "Dependency.h"\r
+\r
+//\r
+// Define the initial size of the dependency expression evaluation stack\r
+//\r
+#define DEPEX_STACK_SIZE_INCREMENT 0x1000\r
+\r
+//\r
+// Type of stack element\r
+//\r
+typedef enum {\r
+ BooleanType,\r
+ VersionType\r
+} ELEMENT_TYPE;\r
+\r
+//\r
+// Value of stack element\r
+//\r
+typedef union {\r
+ BOOLEAN Boolean;\r
+ UINT32 Version;\r
+} ELEMENT_VALUE;\r
+\r
+//\r
+// Stack element used to evaluate dependency expressions\r
+//\r
+typedef struct {\r
+ ELEMENT_VALUE Value;\r
+ ELEMENT_TYPE Type;\r
+} DEPEX_ELEMENT;\r
+\r
+//\r
+// Global variable used to support dependency evaluation\r
+//\r
+UINTN mNumberOfFmpInstance = 0;\r
+EFI_FIRMWARE_IMAGE_DESCRIPTOR **mFmpImageInfoBuf = NULL;\r
+\r
+//\r
+// Indicates the status of dependency check, default value is DEPENDENCIES_SATISFIED.\r
+//\r
+UINT8 mDependenciesCheckStatus = DEPENDENCIES_SATISFIED;\r
+\r
+//\r
+// Global stack used to evaluate dependency expressions\r
+//\r
+DEPEX_ELEMENT *mDepexEvaluationStack = NULL;\r
+DEPEX_ELEMENT *mDepexEvaluationStackEnd = NULL;\r
+DEPEX_ELEMENT *mDepexEvaluationStackPointer = NULL;\r
+\r
+/**\r
+ Grow size of the Depex stack\r
+\r
+ @retval EFI_SUCCESS Stack successfully growed.\r
+ @retval EFI_OUT_OF_RESOURCES There is not enough system memory to grow the stack.\r
+\r
+**/\r
+EFI_STATUS\r
+GrowDepexStack (\r
+ VOID\r
+ )\r
+{\r
+ DEPEX_ELEMENT *NewStack;\r
+ UINTN Size;\r
+\r
+ Size = DEPEX_STACK_SIZE_INCREMENT;\r
+ if (mDepexEvaluationStack != NULL) {\r
+ Size = Size + (mDepexEvaluationStackEnd - mDepexEvaluationStack);\r
+ }\r
+\r
+ NewStack = AllocatePool (Size * sizeof (DEPEX_ELEMENT));\r
+ if (NewStack == NULL) {\r
+ return EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ if (mDepexEvaluationStack != NULL) {\r
+ //\r
+ // Copy to Old Stack to the New Stack\r
+ //\r
+ CopyMem (\r
+ NewStack,\r
+ mDepexEvaluationStack,\r
+ (mDepexEvaluationStackEnd - mDepexEvaluationStack) * sizeof (DEPEX_ELEMENT)\r
+ );\r
+\r
+ //\r
+ // Free The Old Stack\r
+ //\r
+ FreePool (mDepexEvaluationStack);\r
+ }\r
+\r
+ //\r
+ // Make the Stack pointer point to the old data in the new stack\r
+ //\r
+ mDepexEvaluationStackPointer = NewStack + (mDepexEvaluationStackPointer - mDepexEvaluationStack);\r
+ mDepexEvaluationStack = NewStack;\r
+ mDepexEvaluationStackEnd = NewStack + Size;\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+/**\r
+ Push an element onto the Stack.\r
+\r
+ @param[in] Value Value to push.\r
+ @param[in] Type Element Type\r
+\r
+ @retval EFI_SUCCESS The value was pushed onto the stack.\r
+ @retval EFI_OUT_OF_RESOURCES There is not enough system memory to grow the stack.\r
+ @retval EFI_INVALID_PARAMETER Wrong stack element type.\r
+\r
+**/\r
+EFI_STATUS\r
+Push (\r
+ IN UINT32 Value,\r
+ IN UINTN Type\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ DEPEX_ELEMENT Element;\r
+\r
+ //\r
+ // Check Type\r
+ //\r
+ if (Type != BooleanType && Type != VersionType) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ //\r
+ // Check for a stack overflow condition\r
+ //\r
+ if (mDepexEvaluationStackPointer == mDepexEvaluationStackEnd) {\r
+ //\r
+ // Grow the stack\r
+ //\r
+ Status = GrowDepexStack ();\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+ }\r
+\r
+ Element.Value.Version = Value;\r
+ Element.Type = Type;\r
+\r
+ //\r
+ // Push the item onto the stack\r
+ //\r
+ *mDepexEvaluationStackPointer = Element;\r
+ mDepexEvaluationStackPointer++;\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+\r
+/**\r
+ Pop an element from the stack.\r
+\r
+ @param[in] Value Element to pop.\r
+ @param[in] Type Type of element.\r
+\r
+ @retval EFI_SUCCESS The value was popped onto the stack.\r
+ @retval EFI_ACCESS_DENIED The pop operation underflowed the stack.\r
+ @retval EFI_INVALID_PARAMETER Type is mismatched.\r
+\r
+**/\r
+EFI_STATUS\r
+Pop (\r
+ OUT DEPEX_ELEMENT *Element,\r
+ IN ELEMENT_TYPE Type\r
+ )\r
+{\r
+ //\r
+ // Check for a stack underflow condition\r
+ //\r
+ if (mDepexEvaluationStackPointer == mDepexEvaluationStack) {\r
+ return EFI_ACCESS_DENIED;\r
+ }\r
+\r
+ //\r
+ // Pop the item off the stack\r
+ //\r
+ mDepexEvaluationStackPointer--;\r
+ *Element = *mDepexEvaluationStackPointer;\r
+ if ((*Element).Type != Type) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+/**\r
+ Evaluate the dependencies.\r
+\r
+ @param[in] Dependencies Dependency expressions.\r
+ @param[in] DependenciesSize Size of Dependency expressions.\r
+\r
+ @retval TRUE Dependency expressions evaluate to TRUE.\r
+ @retval FALSE Dependency expressions evaluate to FALSE.\r
+\r
+**/\r
+BOOLEAN\r
+EvaluateDependencies (\r
+ IN CONST EFI_FIRMWARE_IMAGE_DEP * Dependencies,\r
+ IN CONST UINTN DependenciesSize\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ UINT8 *Iterator;\r
+ UINT8 Index;\r
+ DEPEX_ELEMENT Element1;\r
+ DEPEX_ELEMENT Element2;\r
+ GUID ImageTypeId;\r
+ UINT32 Version;\r
+\r
+ if (Dependencies == NULL || DependenciesSize == 0) {\r
+ return FALSE;\r
+ }\r
+\r
+ //\r
+ // Clean out memory leaks in Depex Boolean stack. Leaks are only caused by\r
+ // incorrectly formed DEPEX expressions\r
+ //\r
+ mDepexEvaluationStackPointer = mDepexEvaluationStack;\r
+\r
+ Iterator = (UINT8 *) Dependencies->Dependencies;\r
+ while (Iterator < (UINT8 *) Dependencies->Dependencies + DependenciesSize) {\r
+ switch (*Iterator)\r
+ {\r
+ case EFI_FMP_DEP_PUSH_GUID:\r
+ if (Iterator + sizeof (EFI_GUID) >= (UINT8 *) Dependencies->Dependencies + DependenciesSize) {\r
+ Status = EFI_INVALID_PARAMETER;\r
+ goto Error;\r
+ }\r
+\r
+ CopyGuid (&ImageTypeId, (EFI_GUID *) (Iterator + 1));\r
+ Iterator = Iterator + sizeof (EFI_GUID);\r
+\r
+ for (Index = 0; Index < mNumberOfFmpInstance; Index ++){\r
+ if (mFmpImageInfoBuf[Index] == NULL) {\r
+ continue;\r
+ }\r
+ if(CompareGuid (&mFmpImageInfoBuf[Index]->ImageTypeId, &ImageTypeId)){\r
+ Status = Push (mFmpImageInfoBuf[Index]->Version, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ }\r
+ }\r
+ if (Index == mNumberOfFmpInstance) {\r
+ Status = EFI_NOT_FOUND;\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_PUSH_VERSION:\r
+ if (Iterator + sizeof (UINT32) >= (UINT8 *) Dependencies->Dependencies + DependenciesSize ) {\r
+ Status = EFI_INVALID_PARAMETER;\r
+ goto Error;\r
+ }\r
+\r
+ Version = *(UINT32 *) (Iterator + 1);\r
+ Status = Push (Version, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Iterator = Iterator + sizeof (UINT32);\r
+ break;\r
+ case EFI_FMP_DEP_VERSION_STR:\r
+ Iterator += AsciiStrnLenS ((CHAR8 *) Iterator, DependenciesSize - (Iterator - Dependencies->Dependencies));\r
+ break;\r
+ case EFI_FMP_DEP_AND:\r
+ Status = Pop (&Element1, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Pop (&Element2, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Push (Element1.Value.Boolean & Element2.Value.Boolean, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_OR:\r
+ Status = Pop (&Element1, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Pop(&Element2, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Push (Element1.Value.Boolean | Element2.Value.Boolean, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_NOT:\r
+ Status = Pop (&Element1, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Push (!(Element1.Value.Boolean), BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_TRUE:\r
+ Status = Push (TRUE, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_FALSE:\r
+ Status = Push (FALSE, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_EQ:\r
+ Status = Pop (&Element1, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Pop (&Element2, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = (Element1.Value.Version == Element2.Value.Version) ? Push (TRUE, BooleanType) : Push (FALSE, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_GT:\r
+ Status = Pop (&Element1, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Pop (&Element2, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = (Element1.Value.Version > Element2.Value.Version) ? Push (TRUE, BooleanType) : Push (FALSE, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_GTE:\r
+ Status = Pop (&Element1, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Pop (&Element2, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = (Element1.Value.Version >= Element2.Value.Version) ? Push (TRUE, BooleanType) : Push (FALSE, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_LT:\r
+ Status = Pop (&Element1, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Pop (&Element2, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = (Element1.Value.Version < Element2.Value.Version) ? Push (TRUE, BooleanType) : Push (FALSE, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_LTE:\r
+ Status = Pop (&Element1, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = Pop (&Element2, VersionType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ Status = (Element1.Value.Version <= Element2.Value.Version) ? Push (TRUE, BooleanType) : Push (FALSE, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ break;\r
+ case EFI_FMP_DEP_END:\r
+ Status = Pop (&Element1, BooleanType);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Error;\r
+ }\r
+ return Element1.Value.Boolean;\r
+ default:\r
+ Status = EFI_INVALID_PARAMETER;\r
+ goto Error;\r
+ }\r
+ Iterator++;\r
+ }\r
+\r
+Error:\r
+\r
+ DEBUG ((DEBUG_ERROR, "FmpDxe(%s): EvaluateDependencies() - RESULT = FALSE (Status = %r)\n", mImageIdName, Status));\r
+ return FALSE;\r
+}\r
+\r
+/**\r
+ Validate the dependency expression and output its size.\r
+\r
+ @param[in] ImageDepex Pointer to the EFI_FIRMWARE_IMAGE_DEP.\r
+ @param[in] MaxDepexSize Max size of the dependency.\r
+ @param[out] DepexSize Size of dependency.\r
+\r
+ @retval TRUE The capsule is valid.\r
+ @retval FALSE The capsule is invalid.\r
+\r
+**/\r
+BOOLEAN\r
+ValidateImageDepex (\r
+ IN EFI_FIRMWARE_IMAGE_DEP *ImageDepex,\r
+ IN CONST UINTN MaxDepexSize,\r
+ OUT UINT32 *DepexSize\r
+ )\r
+{\r
+ UINT8 *Depex;\r
+\r
+ *DepexSize = 0;\r
+ Depex = ImageDepex->Dependencies;\r
+ while (Depex < ImageDepex->Dependencies + MaxDepexSize) {\r
+ switch (*Depex)\r
+ {\r
+ case EFI_FMP_DEP_PUSH_GUID:\r
+ Depex += sizeof (EFI_GUID) + 1;\r
+ break;\r
+ case EFI_FMP_DEP_PUSH_VERSION:\r
+ Depex += sizeof (UINT32) + 1;\r
+ break;\r
+ case EFI_FMP_DEP_VERSION_STR:\r
+ Depex += AsciiStrnLenS ((CHAR8 *) Depex, ImageDepex->Dependencies + MaxDepexSize - Depex) + 1;\r
+ break;\r
+ case EFI_FMP_DEP_AND:\r
+ case EFI_FMP_DEP_OR:\r
+ case EFI_FMP_DEP_NOT:\r
+ case EFI_FMP_DEP_TRUE:\r
+ case EFI_FMP_DEP_FALSE:\r
+ case EFI_FMP_DEP_EQ:\r
+ case EFI_FMP_DEP_GT:\r
+ case EFI_FMP_DEP_GTE:\r
+ case EFI_FMP_DEP_LT:\r
+ case EFI_FMP_DEP_LTE:\r
+ Depex += 1;\r
+ break;\r
+ case EFI_FMP_DEP_END:\r
+ Depex += 1;\r
+ *DepexSize = (UINT32)(Depex - ImageDepex->Dependencies);\r
+ return TRUE;\r
+ default:\r
+ return FALSE;\r
+ }\r
+ }\r
+\r
+ return FALSE;\r
+}\r
+\r
+\r
+/**\r
+ Get the size of dependencies. Assume the dependencies is validated before\r
+ calling this function.\r
+\r
+ @param[in] Dependencies Pointer to the EFI_FIRMWARE_IMAGE_DEP.\r
+\r
+ @retval The size of dependencies.\r
+\r
+**/\r
+UINTN\r
+GetDepexSize (\r
+ IN CONST EFI_FIRMWARE_IMAGE_DEP *Dependencies\r
+ )\r
+{\r
+ UINTN Index;\r
+\r
+ if (Dependencies == NULL) {\r
+ return 0;\r
+ }\r
+\r
+ Index = 0;\r
+ while (Dependencies->Dependencies[Index] != EFI_FMP_DEP_END) {\r
+ Index ++;\r
+ }\r
+\r
+ return Index + 1;\r
+}\r
+\r
+/**\r
+ Check dependency for firmware update.\r
+\r
+ @param[in] ImageTypeId Image Type Id.\r
+ @param[in] Version New version.\r
+ @param[in] Dependencies The dependencies.\r
+ @param[in] DependenciesSize Size of the dependencies\r
+ @param[out] IsSatisfied Indicate the dependencies is satisfied or not.\r
+\r
+ @retval EFI_SUCCESS Dependency Evaluation is successful.\r
+ @retval Others Dependency Evaluation fails with unexpected error.\r
+\r
+**/\r
+EFI_STATUS\r
+EvaluateImageDependencies (\r
+ IN CONST EFI_GUID ImageTypeId,\r
+ IN CONST UINT32 Version,\r
+ IN CONST EFI_FIRMWARE_IMAGE_DEP *Dependencies,\r
+ IN CONST UINT32 DependenciesSize,\r
+ OUT BOOLEAN *IsSatisfied\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_HANDLE *HandleBuffer;\r
+ UINTN Index;\r
+ EFI_FIRMWARE_MANAGEMENT_PROTOCOL *Fmp;\r
+ UINTN ImageInfoSize;\r
+ UINT32 FmpImageInfoDescriptorVer;\r
+ UINT8 FmpImageInfoCount;\r
+ UINTN DescriptorSize;\r
+ UINT32 PackageVersion;\r
+ CHAR16 *PackageVersionName;\r
+ UINTN DepexSize;\r
+\r
+ *IsSatisfied = TRUE;\r
+ PackageVersionName = NULL;\r
+\r
+ //\r
+ // Get ImageDescriptors of all FMP instances, and archive them for depex evaluation.\r
+ //\r
+ Status = gBS->LocateHandleBuffer (\r
+ ByProtocol,\r
+ &gEfiFirmwareManagementProtocolGuid,\r
+ NULL,\r
+ &mNumberOfFmpInstance,\r
+ &HandleBuffer\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return EFI_ABORTED;\r
+ }\r
+\r
+ mFmpImageInfoBuf = AllocatePool (sizeof(EFI_FIRMWARE_IMAGE_DESCRIPTOR *) * mNumberOfFmpInstance);\r
+ if (mFmpImageInfoBuf == NULL) {\r
+ return EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ for (Index = 0; Index < mNumberOfFmpInstance; Index ++) {\r
+ Status = gBS->HandleProtocol (\r
+ HandleBuffer[Index],\r
+ &gEfiFirmwareManagementProtocolGuid,\r
+ (VOID **) &Fmp\r
+ );\r
+ if (EFI_ERROR(Status)) {\r
+ continue;\r
+ }\r
+\r
+ ImageInfoSize = 0;\r
+ Status = Fmp->GetImageInfo (\r
+ Fmp,\r
+ &ImageInfoSize,\r
+ NULL,\r
+ NULL,\r
+ NULL,\r
+ NULL,\r
+ NULL,\r
+ NULL\r
+ );\r
+ if (Status != EFI_BUFFER_TOO_SMALL) {\r
+ continue;\r
+ }\r
+\r
+ mFmpImageInfoBuf[Index] = AllocateZeroPool (ImageInfoSize);\r
+ if (mFmpImageInfoBuf[Index] == NULL) {\r
+ continue;\r
+ }\r
+\r
+ Status = Fmp->GetImageInfo (\r
+ Fmp,\r
+ &ImageInfoSize, // ImageInfoSize\r
+ mFmpImageInfoBuf[Index], // ImageInfo\r
+ &FmpImageInfoDescriptorVer, // DescriptorVersion\r
+ &FmpImageInfoCount, // DescriptorCount\r
+ &DescriptorSize, // DescriptorSize\r
+ &PackageVersion, // PackageVersion\r
+ &PackageVersionName // PackageVersionName\r
+ );\r
+ if (EFI_ERROR(Status)) {\r
+ FreePool (mFmpImageInfoBuf[Index]);\r
+ mFmpImageInfoBuf[Index] = NULL;\r
+ continue;\r
+ }\r
+\r
+ if (PackageVersionName != NULL) {\r
+ FreePool (PackageVersionName);\r
+ PackageVersionName = NULL;\r
+ }\r
+ }\r
+\r
+ //\r
+ // Step 1 - Evaluate firmware image's depex, against the version of other Fmp instances.\r
+ //\r
+ if (Dependencies != NULL) {\r
+ *IsSatisfied = EvaluateDependencies (Dependencies, DependenciesSize);\r
+ }\r
+\r
+ if (!*IsSatisfied) {\r
+ goto cleanup;\r
+ }\r
+\r
+ //\r
+ // Step 2 - Evaluate the depex of all other Fmp instances, against the new version in\r
+ // the firmware image.\r
+ //\r
+\r
+ //\r
+ // Update the new version to mFmpImageInfoBuf.\r
+ //\r
+ for (Index = 0; Index < mNumberOfFmpInstance; Index ++) {\r
+ if (mFmpImageInfoBuf[Index] != NULL) {\r
+ if (CompareGuid (&ImageTypeId, &mFmpImageInfoBuf[Index]->ImageTypeId)) {\r
+ mFmpImageInfoBuf[Index]->Version = Version;\r
+ break;\r
+ }\r
+ }\r
+ }\r
+\r
+ //\r
+ // Evaluate the Dependencies one by one.\r
+ //\r
+ for (Index = 0; Index < mNumberOfFmpInstance; Index ++) {\r
+ if (mFmpImageInfoBuf[Index] != NULL) {\r
+ //\r
+ // Skip the Fmp instance to be "SetImage".\r
+ //\r
+ if (CompareGuid (&ImageTypeId, &mFmpImageInfoBuf[Index]->ImageTypeId)) {\r
+ continue;\r
+ }\r
+ if ((mFmpImageInfoBuf[Index]->AttributesSupported & IMAGE_ATTRIBUTE_DEPENDENCY) &&\r
+ mFmpImageInfoBuf[Index]->Dependencies != NULL) {\r
+ //\r
+ // Get the size of depex.\r
+ // Assume that the dependencies in EFI_FIRMWARE_IMAGE_DESCRIPTOR is validated when PopulateDescriptor().\r
+ //\r
+ DepexSize = GetDepexSize (mFmpImageInfoBuf[Index]->Dependencies);\r
+ if (DepexSize > 0) {\r
+ *IsSatisfied = EvaluateDependencies (mFmpImageInfoBuf[Index]->Dependencies, DepexSize);\r
+ if (!*IsSatisfied) {\r
+ break;\r
+ }\r
+ }\r
+ }\r
+ }\r
+ }\r
+\r
+cleanup:\r
+ if (mFmpImageInfoBuf != NULL) {\r
+ for (Index = 0; Index < mNumberOfFmpInstance; Index ++) {\r
+ if (mFmpImageInfoBuf[Index] != NULL) {\r
+ FreePool (mFmpImageInfoBuf[Index]);\r
+ }\r
+ }\r
+ FreePool (mFmpImageInfoBuf);\r
+ }\r
+\r
+ return EFI_SUCCESS;\r
+}\r
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