From f80580f56b267c96f16f985dbf707b2f96947da4 Mon Sep 17 00:00:00 2001
From: Dimitrije Pavlov <dimitrije.pavlov@arm.com>
Date: Wed, 17 Aug 2022 09:35:03 -0500
Subject: OvmfPkg/VirtioNetDxe: Check ChildHandle argument in GetControllerName

Per the UEFI specification, a device driver implementation should return
EFI_UNSUPPORTED if the ChildHandle argument in
EFI_COMPONENT_NAME2_PROTOCOL.GetControllerName() is not NULL.

Signed-off-by: Dimitrije Pavlov <Dimitrije.Pavlov@arm.com>
Reviewed-by: Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>
Reviewed-by: Sunny Wang <sunny.wang@arm.com>
---
 OvmfPkg/VirtioNetDxe/ComponentName.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'OvmfPkg/VirtioNetDxe')

diff --git a/OvmfPkg/VirtioNetDxe/ComponentName.c b/OvmfPkg/VirtioNetDxe/ComponentName.c
index e340ca2f8f..718096630f 100644
--- a/OvmfPkg/VirtioNetDxe/ComponentName.c
+++ b/OvmfPkg/VirtioNetDxe/ComponentName.c
@@ -129,6 +129,13 @@ VirtioNetGetControllerName (
     return EFI_INVALID_PARAMETER;
   }
 
+  //
+  // This is a device driver, so ChildHandle must be NULL.
+  //
+  if (ChildHandle != NULL) {
+    return EFI_UNSUPPORTED;
+  }
+
   //
   // confirm that the device is managed by this driver, using the VirtIo
   // Protocol
-- 
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