From 99b3443369703ba69d962019edeca8f1c7c7896e Mon Sep 17 00:00:00 2001
From: Philippe Antoine <contact@catenacyber.fr>
Date: Tue, 22 Feb 2022 13:10:59 +0100
Subject: [PATCH] smtp: check if there is a transaction to close

Ticket: 4948

When parsing the response for starttls
---
 src/app-layer-smtp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/app-layer-smtp.c b/src/app-layer-smtp.c
index 080a864092..ea11139580 100644
--- a/src/app-layer-smtp.c
+++ b/src/app-layer-smtp.c
@@ -928,7 +928,9 @@ static int SMTPProcessReply(SMTPState *state, Flow *f,
             /* we are entering STARRTTLS data mode */
             state->parser_state |= SMTP_PARSER_STATE_COMMAND_DATA_MODE;
             AppLayerRequestProtocolTLSUpgrade(f);
-            SMTPTransactionComplete(state);
+            if (state->curr_tx) {
+                SMTPTransactionComplete(state);
+            }
         } else {
             /* decoder event */
             SMTPSetEvent(state, SMTP_DECODER_EVENT_TLS_REJECTED);
-- 
2.47.2