Handle empty dir passed to grub_find_root_device_from_mountinfo; fixes grub-mkrelpath...

diff --git a/grub-core/kern/emu/getroot.c b/grub-core/kern/emu/getroot.c
index 92ff971e5be30bb192159b91b5c045126cdf28f7..c1ed35b2dca717799f8c76a7edb2e6d7b264b001 100644 (file)
--- a/grub-core/kern/emu/getroot.c
+++ b/grub-core/kern/emu/getroot.c
@@ -111,6 +111,8 @@ grub_find_root_device_from_mountinfo (const char *dir, char **relroot)
   size_t len = 0;
   char *ret = NULL;
 
+  if (! *dir)
+    dir = "/";
   if (relroot)
     *relroot = NULL;