nfsd: Fix memory leak of so_owner.data in nfs4_stateowner

v2, new helper nfs4_free_stateowner for freeing so_owner.data and sop
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -990,6 +990,12 @@ release_all_access(struct nfs4_ol_stateid *stp)
 	}
 }
 
+static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
+{
+	kfree(sop->so_owner.data);
+	sop->so_ops->so_free(sop);
+}
+
 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
 {
 	struct nfs4_client *clp = sop->so_client;
@@ -1000,8 +1006,7 @@ static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
 		return;
 	sop->so_ops->so_unhash(sop);
 	spin_unlock(&clp->cl_lock);
-	kfree(sop->so_owner.data);
-	sop->so_ops->so_free(sop);
+	nfs4_free_stateowner(sop);
 }
 
 static void unhash_ol_stateid(struct nfs4_ol_stateid *stp)
@@ -3318,7 +3323,8 @@ alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
 		hash_openowner(oo, clp, strhashval);
 		ret = oo;
 	} else
-		nfs4_free_openowner(&oo->oo_owner);
+		nfs4_free_stateowner(&oo->oo_owner);
+
 	spin_unlock(&clp->cl_lock);
 	return ret;
 }
@@ -5219,7 +5225,8 @@ alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
 			 &clp->cl_ownerstr_hashtbl[strhashval]);
 		ret = lo;
 	} else
-		nfs4_free_lockowner(&lo->lo_owner);
+		nfs4_free_stateowner(&lo->lo_owner);
+
 	spin_unlock(&clp->cl_lock);
 	return ret;
 }