lib-ssl-iostream: ostream-openssl: Fix behavior of o_stream_flush() so that 1 is...

diff --git a/src/lib-ssl-iostream/ostream-openssl.c b/src/lib-ssl-iostream/ostream-openssl.c
index 44b06201cf5823bc597ac37da70f28296d0595f2..138e6626cd275078c22c595afe3596875c5c6ef4 100644 (file)
--- a/src/lib-ssl-iostream/ostream-openssl.c
+++ b/src/lib-ssl-iostream/ostream-openssl.c
@@ -138,7 +138,13 @@ static int o_stream_ssl_flush(struct ostream_private *stream)
                sstream->ssl_io->ostream_flush_waiting_input = TRUE;
                ret = 1;
        }
-       return ret;
+
+       if (ret <= 0)
+               return ret;
+
+       /* return 1 only when the output buffer is empty, which is what the
+          caller expects. */
+       return o_stream_get_buffer_used_size(plain_output) == 0 ? 1 : 0;
 }
 
 static ssize_t