grub2/0090-ls-prevent-double-open.patch

From 3d8df86d825ff07a8eeb202329b8731fd1a4a24e Mon Sep 17 00:00:00 2001
From: Eric Snowberg <eric.snowberg@oracle.com>
Date: Mon, 13 Nov 2017 08:27:28 -0800
Subject: [PATCH] ls: prevent double open

Prevent a double open.  This can cause problems with some ieee1275
devices, causing the system to hang.  The double open can occur
as follows:

grub_ls_list_files (char *dirname, int longlist, int all, int human)
       dev = grub_device_open (device_name);
       dev remains open while:
       grub_normal_print_device_info (device_name);
                dev = grub_device_open (name);

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/commands/ls.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/grub-core/commands/ls.c b/grub-core/commands/ls.c
index 0eaf8365279..c25161cc4f2 100644
--- a/grub-core/commands/ls.c
+++ b/grub-core/commands/ls.c
@@ -201,6 +201,15 @@ grub_ls_list_files (char *dirname, int longlist, int all, int human)
       if (grub_errno == GRUB_ERR_UNKNOWN_FS)
 	grub_errno = GRUB_ERR_NONE;
 
+#ifdef GRUB_MACHINE_IEEE1275
+      /*
+       * Close device to prevent a double open in grub_normal_print_device_info().
+       * Otherwise it may lead to hangs on some IEEE 1275 platforms.
+       */
+      grub_device_close (dev);
+      dev = NULL;
+#endif
+
       grub_normal_print_device_info (device_name);
     }
   else if (fs)