dialog: check CSeq careful with track_cseq_updates

to avoid null pointer access for malformed messages (cherry picked from commit 59c7bf4)
kamailio · Jun 5, 2018 · 12ddd12 · 12ddd12
1 parent fa87c0b
commit 12ddd12
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/modules/dialog/dlg_cseq.c b/src/modules/dialog/dlg_cseq.c
@@ -73,7 +73,8 @@ static int dlg_cseq_prepare_msg(sip_msg_t *msg)
 		return 1;
 	}
 
-	if (parse_headers(msg, HDR_CSEQ_F, 0)==-1) {
+	if((!msg->cseq && (parse_headers(msg,HDR_CSEQ_F,0)<0 || !msg->cseq))
+		|| !msg->cseq->parsed){
 		LM_DBG("parsing cseq header failed\n");
 		return 2;
 	}