https://bugzilla.cyrusimap.org/show_bug.cgi?id=3920

--- saslauthd/auth_rimap.orig	2016-02-19 21:55:07.000000000 -0500

+++ saslauthd/auth_rimap.c	2016-02-19 21:55:36.000000000 -0500

@@ -383,7 +383,7 @@

         while( select (fds, &perm, NULL, NULL, &timeout ) >0 ) {

            if ( FD_ISSET(s, &perm) ) {

               ret = read(s, rbuf+rc, sizeof(rbuf)-rc);

-              if ( ret<0 ) {

+              if ( ret<=0 ) {

                  rc = ret;

                  break;

               } else {

@@ -496,7 +496,7 @@

         while( select (fds, &perm, NULL, NULL, &timeout ) >0 ) {

            if ( FD_ISSET(s, &perm) ) {

               ret = read(s, rbuf+rc, sizeof(rbuf)-rc);

-              if ( ret<0 ) {

+              if ( ret<=0 ) {

                  rc = ret;

                  break;

               } else {