SUNRPC: Temporary sockets should inherit the cred from their parent

Temporary sockets should inherit the credential (and hence the user
namespace) from the parent listener transport.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

net/sunrpc/svc_xprt.c

@@ -786,9 +786,10 @@ static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt)
 		__module_get(xprt->xpt_class->xcl_owner);
 		svc_check_conn_limits(xprt->xpt_server);
 		newxpt = xprt->xpt_ops->xpo_accept(xprt);
-		if (newxpt)
+		if (newxpt) {
+			newxpt->xpt_cred = get_cred(xprt->xpt_cred);
 			svc_add_new_temp_xprt(serv, newxpt);
-		else
+		} else
 			module_put(xprt->xpt_class->xcl_owner);
 	} else if (svc_xprt_reserve_slot(rqstp, xprt)) {
 		/* XPT_DATA|XPT_DEFERRED case: */