From 68bb5ce77e51cf35791e46f2202e36da97e5e6be Mon Sep 17 00:00:00 2001
From: erictian <erictian@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 26 Nov 2010 01:49:27 +0000
Subject: [PATCH] EHCI Controllers with a CapLen of 0 are ignored.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11093 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c b/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c
index 87e4aa079b..852a15adcb 100644
--- a/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c
+++ b/MdeModulePkg/Bus/Pci/EhciDxe/Ehci.c
@@ -1437,6 +1437,14 @@ EhcCreateUsb2Hc (
 
   DEBUG ((EFI_D_INFO, "EhcCreateUsb2Hc: capability length %d\n", Ehc->CapLen));
 
+  //
+  // EHCI Controllers with a CapLen of 0 are ignored.
+  //
+  if (Ehc->CapLen == 0) {
+    gBS->FreePool (Ehc);
+    return NULL;
+  }
+
   //
   // Create AsyncRequest Polling Timer
   //
-- 
2.39.2