lib-ssl-iostream: When plain_output's buffer is full, set it flush-pending.

This fixes hangs when the output buffer got full.

diff --git a/src/lib-ssl-iostream/iostream-openssl.c b/src/lib-ssl-iostream/iostream-openssl.c
index 81e5f26d3546ae4cbad6613bb6a62e1d50d6fe47..cfd56a33d34cd029396802c29b3c790a52e2dc6a 100644 (file)
--- a/src/lib-ssl-iostream/iostream-openssl.c
+++ b/src/lib-ssl-iostream/iostream-openssl.c
@@ -268,6 +268,8 @@ static bool ssl_iostream_bio_output(struct ssl_iostream *ssl_io)
                if (bytes > max_bytes) {
                        if (max_bytes == 0) {
                                /* wait until output buffer clears */
+                               o_stream_set_flush_pending(ssl_io->plain_output,
+                                                          TRUE);
                                break;
                        }
                        bytes = max_bytes;