From d20dd3510529e8d59da4804e91da2f29383e1c30 Mon Sep 17 00:00:00 2001
From: Download-Fritz <download-fritz@outlook.com>
Date: Tue, 11 Jun 2019 21:41:34 +0200
Subject: [PATCH] OcBootManagementLib: Fix potential OOB access

---
 Library/OcBootManagementLib/BootEntryInfo.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Library/OcBootManagementLib/BootEntryInfo.c b/Library/OcBootManagementLib/BootEntryInfo.c
index 0642fbff..a83621b6 100644
--- a/Library/OcBootManagementLib/BootEntryInfo.c
+++ b/Library/OcBootManagementLib/BootEntryInfo.c
@@ -291,6 +291,7 @@ InternalSetBootEntryFlags (
 {
   EFI_DEVICE_PATH_PROTOCOL  *DevicePathWalker;
   CONST CHAR16              *Path;
+  UINTN                     Len;
 
   BootEntry->IsFolder   = FALSE;
   BootEntry->IsRecovery = FALSE;
@@ -306,7 +307,8 @@ InternalSetBootEntryFlags (
     if ((DevicePathType (DevicePathWalker) == MEDIA_DEVICE_PATH)
      && (DevicePathSubType (DevicePathWalker) == MEDIA_FILEPATH_DP)) {
       Path   = ((FILEPATH_DEVICE_PATH *) DevicePathWalker)->PathName;
-      if (Path[StrLen (Path) - 1] == L'\\') {
+      Len    = StrLen (Path);
+      if ((Len > 0) && (Path[Len - 1] == L'\\')) {
         BootEntry->IsFolder = TRUE;
       }
       if (StrStr (Path, L"com.apple.recovery.boot") != NULL) {