[PATCH] progress: Check for NULL filename

[dann frazier <dann.frazier@canonical.com>]

Avoid a NULL pointer dereference if the upper fs layer hasn't set the
file->name field. Files opened through the grub_net_fs interface currently do
not have this field set (though perhaps they should?).

Signed-off-by: dann frazier <dann.frazier@canonical.com>
---
 grub-core/lib/progress.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/grub-core/lib/progress.c b/grub-core/lib/progress.c
index 63a0767..2775554 100644
--- a/grub-core/lib/progress.c
+++ b/grub-core/lib/progress.c
@@ -70,8 +70,7 @@ grub_file_progress_hook_real (grub_disk_addr_t sector __attribute__ ((unused)),
 	percent = grub_divmod64 (100 * file->progress_offset,
 				 file->size, 0);
 
-      partial_file_name = grub_strrchr (file->name, '/');
-      if (partial_file_name)
+      if (file->name && (partial_file_name = grub_strrchr (file->name, '/')))
 	partial_file_name++;
       else
 	partial_file_name = "";
-- 
2.5.0