From 2498dc7a3aee638215ad47899031496b50633d55 Mon Sep 17 00:00:00 2001
From: Andrei Borzenkov <arvidjaar@gmail.com>
Date: Sun, 17 May 2015 14:16:36 +0300
Subject: [PATCH] hostdisk: fix crash with NULL device.map

grub-macbless calls grub_util_biosdisk_init with NULL device.map.
---
 grub-core/kern/emu/hostdisk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/kern/emu/hostdisk.c b/grub-core/kern/emu/hostdisk.c
index a3b00c8f6..610518d0c 100644
--- a/grub-core/kern/emu/hostdisk.c
+++ b/grub-core/kern/emu/hostdisk.c
@@ -422,7 +422,7 @@ read_device_map (const char *dev_map)
   char buf[1024];	/* XXX */
   int lineno = 0;
 
-  if (dev_map[0] == '\0')
+  if (!dev_map || dev_map[0] == '\0')
     {
       grub_util_info ("no device.map");
       return;