From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrei Borzenkov <arvidjaar@gmail.com>
Date: Thu, 26 Nov 2015 19:50:42 +0300
Subject: [PATCH] efi: really mark memory of unknown type as reserved

9be4c45dbe3c877d1f4856e99ee15133c6cd2261 added switch case between
fall through cases, causing all memory regions of unknown type to be
marked as available.

Move default case into its own block and add explicit FALLTHROUGH
annotation.

Reported by Elliott, Robert (Persistent Memory) <elliott@hpe.com>

(cherry picked from commit 3d2c8048da7db334fd6d57b27304ac765fd4cd67)

Resolves: rhbz#1288608
---
 grub-core/mmap/efi/mmap.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/grub-core/mmap/efi/mmap.c b/grub-core/mmap/efi/mmap.c
index a77efe81d0c..900a4d6598c 100644
--- a/grub-core/mmap/efi/mmap.c
+++ b/grub-core/mmap/efi/mmap.c
@@ -73,6 +73,7 @@ grub_efi_mmap_iterate (grub_memory_hook_t hook, void *hook_data,
 		    GRUB_MEMORY_AVAILABLE, hook_data);
 	      break;
 	    }
+	  /* FALLTHROUGH */
 	case GRUB_EFI_RUNTIME_SERVICES_CODE:
 	  hook (desc->physical_start, desc->num_pages * 4096,
 		GRUB_MEMORY_CODE, hook_data);
@@ -83,10 +84,6 @@ grub_efi_mmap_iterate (grub_memory_hook_t hook, void *hook_data,
 		GRUB_MEMORY_BADRAM, hook_data);
 	  break;
 
-	default:
-	  grub_printf ("Unknown memory type %d, considering reserved\n",
-		       desc->type);
-
 	case GRUB_EFI_BOOT_SERVICES_DATA:
 	  if (!avoid_efi_boot_services)
 	    {
@@ -94,6 +91,7 @@ grub_efi_mmap_iterate (grub_memory_hook_t hook, void *hook_data,
 		    GRUB_MEMORY_AVAILABLE, hook_data);
 	      break;
 	    }
+	  /* FALLTHROUGH */
 	case GRUB_EFI_RESERVED_MEMORY_TYPE:
 	case GRUB_EFI_RUNTIME_SERVICES_DATA:
 	case GRUB_EFI_MEMORY_MAPPED_IO:
@@ -119,6 +117,13 @@ grub_efi_mmap_iterate (grub_memory_hook_t hook, void *hook_data,
 	  hook (desc->physical_start, desc->num_pages * 4096,
 		GRUB_MEMORY_NVS, hook_data);
 	  break;
+
+	default:
+	  grub_printf ("Unknown memory type %d, considering reserved\n",
+		       desc->type);
+	  hook (desc->physical_start, desc->num_pages * 4096,
+		GRUB_MEMORY_RESERVED, hook_data);
+	  break;
 	}
     }