smtp: check if there is a transaction to close

Ticket: 4948

When parsing the response for starttls

(cherry picked from commit 99b3443369703ba69d962019edeca8f1c7c7896e)

diff --git a/src/app-layer-smtp.c b/src/app-layer-smtp.c
index 40607d9ef1d74e586cef2be99b54d41cdfc24ade..ba1d08c2ecea320b1e0b06433e3ed388ab1adc60 100644 (file)
--- a/src/app-layer-smtp.c
+++ b/src/app-layer-smtp.c
@@ -1045,7 +1045,9 @@ 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);