[PATCH] Better UDF oops fix

Rather than not kfree'ing the UDF data in the case of a bad inode (which
still _may_ have had the UDF data already allocated to it), make sure to
initialize the pointer to NULL properly when we're done with it.

fs/udf/inode.c

@@ -126,8 +126,8 @@ void udf_delete_inode(struct inode * inode)
 
 void udf_clear_inode(struct inode *inode)
 {
-	if (!is_bad_inode(inode))
 	kfree(UDF_I_DATA(inode));
+	UDF_I_DATA(inode) = NULL;
 }
 
 void udf_discard_prealloc(struct inode * inode)

fs/udf/super.c

@@ -133,8 +133,10 @@ static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 	struct udf_inode_info *ei = (struct udf_inode_info *) foo;
 
 	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	    SLAB_CTOR_CONSTRUCTOR) {
+		ei->i_ext.i_data = NULL;
 		inode_init_once(&ei->vfs_inode);
+	}
 }
 
 static int init_inodecache(void)