Bug#891773: [PATCH] ieee1275: Fix crash in of_path_of_nvme when of_path is empty

[John Paul Adrian Glaubitz]

The of_path_of_nvme function (commit 2391d57, ieee1275: add nvme
support within ofpath) introduced a functional regression:

On systems which are not based on Open Firmware but have at
least one NVME device, find_obppath will return an empty path
and appending the disk name to of_path will therefore result
in a crash. Thus, when of_path is empty, just return the
disk name in of_path_of_nvme.

Signed-off-by: John Paul Adrian Glaubitz <glaubitz at physik.fu-berlin.de>
---
 grub-core/osdep/linux/ofpath.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/grub-core/osdep/linux/ofpath.c b/grub-core/osdep/linux/ofpath.c
index 1c30e7233..da0000f0f 100644
--- a/grub-core/osdep/linux/ofpath.c
+++ b/grub-core/osdep/linux/ofpath.c
@@ -389,8 +389,13 @@ of_path_of_nvme(const char *sys_devname __attribute__((unused)),
     }
 
   of_path = find_obppath (sysfs_path);
+
+  if(of_path)
+    strcat (of_path, disk);
+  else
+    of_path = strdup(disk);
+
   free (sysfs_path);
-  strcat (of_path, disk);
   return of_path;
 }
 
-- 
2.16.2