[PATCH] vfs: initialize d_iname to null for long file names

[Wu Fengguang <fengguang.wu@intel.com>]

dentry->d_iname is currently uninitialized for long file names.  Init
it to null string to avoid bad behaviors on careless references to it.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
---
diff --git a/fs/dcache.c b/fs/dcache.c
index a1d86c7..29d1768 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -929,6 +929,7 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
 			kmem_cache_free(dentry_cache, dentry); 
 			return NULL;
 		}
+		dentry->d_iname[0] = '\0';
 	} else  {
 		dname = dentry->d_iname;
 	}