Disallow the empty string as a file name.

diff --git a/src/filesys/directory.c b/src/filesys/directory.c
index ec6ecd98715d30ba99acff1449e15b0d440c92ea..b08e7eeba3f65947e0ffe51b097e0d7aa166d24c 100644 (file)
--- a/src/filesys/directory.c
+++ b/src/filesys/directory.c
@@ -140,7 +140,7 @@ dir_add (struct dir *d, const char *name, disk_sector_t inode_sector)
   ASSERT (name != NULL);
   ASSERT (lookup (d, name) == NULL);
 
-  if (strlen (name) > NAME_MAX)
+  if (*name == '\0' || strlen (name) > NAME_MAX)
     return false;
 
   for (i = 0; i < d->entry_cnt; i++)