[PATCH v3 7/7] FmpDevicePkg/FmpDxe: Improve function parameter validation

["Michael Kubacki" <michael.kubacki@outlook.com>]

From: Michael Kubacki <michael.kubacki@microsoft.com>

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2869

Makes some minor improvements to function parameter validation
in FmpDxe, in particular to externally exposed functions such
as those that back EFI_FIRMWARE_MANAGEMENT_PROTOCOL.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Guomin Jiang <guomin.jiang@intel.com>
Cc: Wei6 Xu <wei6.xu@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Guomin Jiang <guomin.jiang@intel.com>
Reviewed-by: Wei6 Xu <wei6.xu@intel.com>
---
 FmpDevicePkg/FmpDxe/FmpDxe.c | 51 ++++++++++++++++++--
 1 file changed, 47 insertions(+), 4 deletions(-)

diff --git a/FmpDevicePkg/FmpDxe/FmpDxe.c b/FmpDevicePkg/FmpDxe/FmpDxe.c
index a3e342591936..854feec0a162 100644
--- a/FmpDevicePkg/FmpDxe/FmpDxe.c
+++ b/FmpDevicePkg/FmpDxe/FmpDxe.c
@@ -278,6 +278,11 @@ PopulateDescriptor (
   EFI_STATUS  Status;
   UINT32      DependenciesSize;
 
+  if (Private == NULL) {
+    DEBUG ((DEBUG_ERROR, "FmpDxe(%s): PopulateDescriptor() - Private is NULL.\n", mImageIdName));
+    return;
+  }
+
   if (Private->DescriptorPopulated) {
     return;
   }
@@ -451,6 +456,12 @@ GetTheImageInfo (
 
   Status = EFI_SUCCESS;
 
+  if (This == NULL) {
+    DEBUG ((DEBUG_ERROR, "FmpDxe(%s): GetImageInfo() - This is NULL.\n", mImageIdName));
+    Status = EFI_INVALID_PARAMETER;
+    goto cleanup;
+  }
+
   //
   // Retrieve the private context structure
   //
@@ -561,6 +572,12 @@ GetTheImage (
 
   Status = EFI_SUCCESS;
 
+  if (This == NULL) {
+    DEBUG ((DEBUG_ERROR, "FmpDxe(%s): GetImage() - This is NULL.\n", mImageIdName));
+    Status = EFI_INVALID_PARAMETER;
+    goto cleanup;
+  }
+
   //
   // Retrieve the private context structure
   //
@@ -615,7 +632,8 @@ GetTheImage (
   @param[in]   Image                 Pointer to the image.
   @param[in]   ImageSize             Size of the image.
   @param[in]   AdditionalHeaderSize  Size of any headers that cannot be calculated by this function.
-  @param[out]  PayloadSize
+  @param[out]  PayloadSize           An optional pointer to a UINTN that holds the size of the payload
+                                     (image size minus headers)
 
   @retval  !NULL  Valid pointer to the header.
   @retval  NULL   Structure is bad and pointer cannot be found.
@@ -626,7 +644,7 @@ GetFmpHeader (
   IN  CONST EFI_FIRMWARE_IMAGE_AUTHENTICATION  *Image,
   IN  CONST UINTN                              ImageSize,
   IN  CONST UINTN                              AdditionalHeaderSize,
-  OUT UINTN                                    *PayloadSize
+  OUT UINTN                                    *PayloadSize OPTIONAL
   )
 {
   //
@@ -640,7 +658,10 @@ GetFmpHeader (
     return NULL;
   }
 
-  *PayloadSize = ImageSize - (sizeof (Image->MonotonicCount) + Image->AuthInfo.Hdr.dwLength + AdditionalHeaderSize);
+  if (PayloadSize != NULL) {
+    *PayloadSize = ImageSize - (sizeof (Image->MonotonicCount) + Image->AuthInfo.Hdr.dwLength + AdditionalHeaderSize);
+  }
+
   return (VOID *)((UINT8 *)Image + sizeof (Image->MonotonicCount) + Image->AuthInfo.Hdr.dwLength  + AdditionalHeaderSize);
 }
 
@@ -663,6 +684,11 @@ GetAllHeaderSize (
 {
   UINT32  CalculatedSize;
 
+  if (Image == NULL) {
+    DEBUG ((DEBUG_ERROR, "FmpDxe(%s): GetAllHeaderSize() - Image is NULL.\n", mImageIdName));
+    return 0;
+  }
+
   CalculatedSize = sizeof (Image->MonotonicCount) +
                    AdditionalHeaderSize +
                    Image->AuthInfo.Hdr.dwLength;
@@ -743,6 +769,12 @@ CheckTheImage (
     return EFI_UNSUPPORTED;
   }
 
+  if (This == NULL) {
+    DEBUG ((DEBUG_ERROR, "FmpDxe(%s): CheckImage() - This is NULL.\n", mImageIdName));
+    Status = EFI_INVALID_PARAMETER;
+    goto cleanup;
+  }
+
   //
   // Retrieve the private context structure
   //
@@ -851,7 +883,7 @@ CheckTheImage (
   if (ImageIndex != 1) {
     DEBUG ((DEBUG_ERROR, "FmpDxe(%s): CheckImage() - Image Index Invalid.\n", mImageIdName));
     *ImageUpdatable = IMAGE_UPDATABLE_INVALID_TYPE;
-    Status = EFI_SUCCESS;
+    Status = EFI_INVALID_PARAMETER;
     goto cleanup;
   }
 
@@ -1026,6 +1058,12 @@ SetTheImage (
     return EFI_UNSUPPORTED;
   }
 
+  if (This == NULL) {
+    DEBUG ((DEBUG_ERROR, "FmpDxe(%s): SetTheImage() - This is NULL.\n", mImageIdName));
+    Status = EFI_INVALID_PARAMETER;
+    goto cleanup;
+  }
+
   //
   // Retrieve the private context structure
   //
@@ -1382,6 +1420,11 @@ FmpDxeLockEventNotify (
   EFI_STATUS                        Status;
   FIRMWARE_MANAGEMENT_PRIVATE_DATA  *Private;
 
+  if (Context == NULL) {
+    ASSERT (Context != NULL);
+    return;
+  }
+
   Private = (FIRMWARE_MANAGEMENT_PRIVATE_DATA *)Context;
 
   if (!Private->FmpDeviceLocked) {
-- 
2.27.0.windows.1