NFSv4: nfs4_open_done first must check that GETATTR decoded a file type

...before it can check the validity of that file type.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -1537,6 +1537,7 @@ static void nfs4_open_done(struct rpc_task *task, void *calldata)
 		return;
 
 	if (task->tk_status == 0) {
+		if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
 			switch (data->o_res.f_attr->mode & S_IFMT) {
 			case S_IFREG:
 				break;
@@ -1549,6 +1550,7 @@ static void nfs4_open_done(struct rpc_task *task, void *calldata)
 			default:
 				data->rpc_status = -ENOTDIR;
 			}
+		}
 		renew_lease(data->o_res.server, data->timestamp);
 		if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 			nfs_confirm_seqid(&data->owner->so_seqid, 0);