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[PATCH] ls: prevent double open

From: Eric Snowberg
Subject: [PATCH] ls: prevent double open
Date: Mon, 16 Oct 2017 13:11:12 -0700

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 <address@hidden>
 grub-core/commands/ls.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/grub-core/commands/ls.c b/grub-core/commands/ls.c
index 0eaf836..a7318ab 100644
--- a/grub-core/commands/ls.c
+++ b/grub-core/commands/ls.c
@@ -201,6 +201,8 @@ grub_ls_list_files (char *dirname, int longlist, int all, 
int human)
       if (grub_errno == GRUB_ERR_UNKNOWN_FS)
        grub_errno = GRUB_ERR_NONE;
+      grub_device_close (dev);
+      dev = NULL;
       grub_normal_print_device_info (device_name);
   else if (fs)

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