[PATCH v3 06/26] StandaloneMmPkg: Fix ECC error 3002 in StandaloneMmCpu

["Sami Mujawar" <sami.mujawar@arm.com>]

Bugzilla: 3150 (https://bugzilla.tianocore.org/show_bug.cgi?id=3150)

Fix the ECC tool reported error "[3002] Non-Boolean comparisons
should use a compare operator".

Also fix the following:
 - add curly braces for 'if' condition statements to comply
   with the coding standard.
 - The value returned by GET_GUID_HOB_DATA() is stored in
   *HobData. Therefore, check *HobData against NULL. The
   original code was checking HobData which is incorrect.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
---

Notes:
    v3:
     - No code change. Added bugzilla ID and resending patch     [SAMI]
       with v3 series.
    
    v2:
     - No code change. Resending patch with v2 series.           [SAMI]

 StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c     | 19 +++++++++++++------
 StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/StandaloneMmCpu.c | 11 +++++++----
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
index 6a25c4c54843ccdc2d745e8e537942d49b1d1141..9738e8bd60149efb45ef1b66139e0cec38b6c1fe 100644
--- a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
+++ b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
@@ -1,7 +1,7 @@
 /** @file
 
   Copyright (c) 2016 HP Development Company, L.P.
-  Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.
+  Copyright (c) 2016 - 2020, Arm Limited. All rights reserved.
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -84,12 +84,18 @@ PiMmStandaloneArmTfCpuDriverEntry (
   }
 
   // Perform parameter validation of NsCommBufferAddr
-  if (NsCommBufferAddr && (NsCommBufferAddr < mNsCommBuffer.PhysicalStart))
+  if (NsCommBufferAddr == (UINTN)NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (NsCommBufferAddr < mNsCommBuffer.PhysicalStart) {
     return EFI_ACCESS_DENIED;
+  }
 
   if ((NsCommBufferAddr + sizeof (EFI_MM_COMMUNICATE_HEADER)) >=
-      (mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize))
+      (mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize)) {
     return EFI_INVALID_PARAMETER;
+  }
 
   // Find out the size of the buffer passed
   NsCommBufferSize = ((EFI_MM_COMMUNICATE_HEADER *) NsCommBufferAddr)->MessageLength +
@@ -97,9 +103,9 @@ PiMmStandaloneArmTfCpuDriverEntry (
 
   // perform bounds check.
   if (NsCommBufferAddr + NsCommBufferSize >=
-      mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize)
+      mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize) {
     return EFI_ACCESS_DENIED;
-
+  }
 
   // Now that the secure world can see the normal world buffer, allocate
   // memory to copy the communication buffer to the secure world.
@@ -192,8 +198,9 @@ PiMmCpuTpFwRootMmiHandler (
   ASSERT (CommBufferSize == NULL);
 
   CpuNumber = mMmst->CurrentlyExecutingCpu;
-  if (!PerCpuGuidedEventContext[CpuNumber])
+  if (PerCpuGuidedEventContext[CpuNumber] == NULL) {
     return EFI_NOT_FOUND;
+  }
 
   DEBUG ((DEBUG_INFO, "CommBuffer - 0x%x, CommBufferSize - 0x%x\n",
           PerCpuGuidedEventContext[CpuNumber],
diff --git a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/StandaloneMmCpu.c b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/StandaloneMmCpu.c
index 617babd5ab4bcb200ee10e19ec6f99c2ef163200..7c004c8013460bb7f1690351aa64eeaa9eab91dc 100644
--- a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/StandaloneMmCpu.c
+++ b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/StandaloneMmCpu.c
@@ -2,7 +2,7 @@
 
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   Copyright (c) 2016 HP Development Company, L.P.
-  Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.
+  Copyright (c) 2016 - 2020, Arm Limited. All rights reserved.
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -53,16 +53,19 @@ GetGuidedHobData (
 {
   EFI_HOB_GUID_TYPE *Hob;
 
-  if (!HobList || !HobGuid || !HobData)
+  if ((HobList == NULL) || (HobGuid == NULL) || (HobData == NULL)) {
     return EFI_INVALID_PARAMETER;
+  }
 
   Hob = GetNextGuidHob (HobGuid, HobList);
-  if (!Hob)
+  if (Hob == NULL) {
     return EFI_NOT_FOUND;
+  }
 
   *HobData = GET_GUID_HOB_DATA (Hob);
-  if (!HobData)
+  if (*HobData == NULL) {
     return EFI_NOT_FOUND;
+  }
 
   return EFI_SUCCESS;
 }
-- 
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'