Re: [edk2-platforms][PATCH v1 1/1] MinPlatformPkg/TestPointCheckLib: Fix out of bounds array index access

["Isaac Oram" <isaac.w.oram@intel.com>]

Reviewed-by: Isaac Oram <isaac.w.oram@intel.com>

-----Original Message-----
From: mikuback@linux.microsoft.com <mikuback@linux.microsoft.com> 
Sent: Friday, September 9, 2022 6:59 AM
To: devel@edk2.groups.io
Cc: Chiu, Chasel <chasel.chiu@intel.com>; Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>; Oram, Isaac W <isaac.w.oram@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Dong, Eric <eric.dong@intel.com>
Subject: [edk2-platforms][PATCH v1 1/1] MinPlatformPkg/TestPointCheckLib: Fix out of bounds array index access

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

The following code accesses array index "6" which is invalid as the array is of length 6.

  DEBUG ((DEBUG_INFO, " %08x %08x %08x %08x %08x %08x",
    PciData->Device.Bar[0],
    PciData->Device.Bar[1],
    PciData->Device.Bar[2],
    PciData->Device.Bar[3],
    PciData->Device.Bar[4],
    PciData->Device.Bar[6]   <-- BAD ARRAY INDEX
    ));

PciData is of type "PCI_TYPE00":

  typedef struct {
    PCI_DEVICE_INDEPENDENT_REGION    Hdr;
    PCI_DEVICE_HEADER_TYPE_REGION    Device;
  } PCI_TYPE00;

"PCI_DEVICE_HEADER_TYPE_REGION":

typedef struct {
  UINT32    Bar[6];          <- NOTE: ARRAY LENGTH IS 6
  UINT32    CISPtr;
  UINT16    SubsystemVendorID;
  UINT16    SubsystemID;
  UINT32    ExpansionRomBar;
  UINT8     CapabilityPtr;
  UINT8     Reserved1[3];
  UINT32    Reserved2;
  UINT8     InterruptLine;
  UINT8     InterruptPin;
  UINT8     MinGnt;
  UINT8     MaxLat;
} PCI_DEVICE_HEADER_TYPE_REGION;

This change fixes the array index value.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Isaac Oram <isaac.w.oram@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Eric Dong <eric.dong@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
---
 Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c
index 514003944758..575284ccc727 100644
--- a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c
+++ b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCh
+++ eckPci.c
@@ -75,7 +75,7 @@ DumpPciDevice (
     PciData->Device.Bar[2],
     PciData->Device.Bar[3],
     PciData->Device.Bar[4],
-    PciData->Device.Bar[6]
+    PciData->Device.Bar[5]
     ));
   DEBUG ((DEBUG_INFO, " %04x\n",
     PciData->Hdr.Command
@@ -256,7 +256,7 @@ TestPointCheckPciResource (
   UINT16                            MinBus;
   UINT16                            MaxBus;
   BOOLEAN                           IsEnd;
-  
+
   DEBUG ((DEBUG_INFO, "==== TestPointCheckPciResource - Enter\n"));
   HandleBuf = NULL;
   Status = gBS->LocateHandleBuffer (
@@ -338,7 +338,7 @@ TestPointCheckPciResource (
                 // Device
                 DumpPciDevice ((UINT8)Bus, (UINT8)Device, (UINT8)Func, &PciData);
               }
-              
+
               //
               // If this is not a multi-function device, we can leave the loop
               // to deal with the next device.
@@ -360,7 +360,7 @@ TestPointCheckPciResource (
       }
     }
   }
-  
+
 Done:
   if (HandleBuf != NULL) {
     FreePool (HandleBuf);
--
2.28.0.windows.1