SUNRPC: Ensure that rpc_mkpipe returns a refcounted dentry

If not, we cannot guarantee that idmap->idmap_dentry, gss_auth->dentry and
clnt->cl_dentry are valid dentries.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 821edd30333b..32c95a0d93f3 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -132,6 +132,8 @@ nfs_idmap_delete(struct nfs4_client *clp)
 
         if (!idmap)
                 return;
+        dput(idmap->idmap_dentry);
+        idmap->idmap_dentry = NULL;
         rpc_unlink(idmap->idmap_path);
         clp->cl_idmap = NULL;
         kfree(idmap);