[edk2-devel] [PATCH v3 1/2] MdeModulePkg/Bus/Pci/PciHostBridgeDxe: Fix OVERRUN Coverity issues

["Ranbir Singh" <rsingh@ventanamicro.com>]

From: Ranbir Singh <Ranbir.Singh3@Dell.com>

The function NotifyPhase has a check

    ASSERT (Index < TypeMax);

but this comes into play only in DEBUG mode. In Release mode, there is
no handling if the Index value is within array limits or not. If for
whatever reasons, the Index does not get re-assigned to Index2 at line
937, then it remains at TypeMax as assigned earlier at line 929. This
poses array overrun risk at lines 942 and 943. It is better to deploy
a safety check on Index limit before accessing array elements.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4212

Cc: Ray Ni <ray.ni@intel.com>
Co-authored-by: Veeresh Sangolli <veeresh.sangolli@dellteam.com>
Signed-off-by: Ranbir Singh <Ranbir.Singh3@Dell.com>
Signed-off-by: Ranbir Singh <rsingh@ventanamicro.com>
---
 MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c b/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
index d573e532bac8..c2c143068cd2 100644
--- a/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
+++ b/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
@@ -939,6 +939,11 @@ NotifyPhase (
             }
 
             ASSERT (Index < TypeMax);
+
+            if (Index == TypeMax) {
+              CpuDeadLoop ();
+            }
+
             ResNodeHandled[Index] = TRUE;
             Alignment             = RootBridge->ResAllocNode[Index].Alignment;
             BitsOfAlignment       = LowBitSet64 (Alignment + 1);
-- 
2.34.1



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