From 0fd71c45c54376ebe88c7a90fa855859cb932d0b Mon Sep 17 00:00:00 2001
From: Victor Julien <victor@inliniac.net>
Date: Wed, 2 Nov 2011 09:49:06 +0100
Subject: [PATCH] Improve asn1 keyword handling of a malformed asn1 state.

---
 src/detect-asn1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/detect-asn1.c b/src/detect-asn1.c
index b7cee9f0d8..12eb109718 100644
--- a/src/detect-asn1.c
+++ b/src/detect-asn1.c
@@ -165,7 +165,7 @@ int DetectAsn1Match(ThreadVars *t, DetectEngineThreadCtx *det_ctx, Packet *p,
 
     /* Ok, now we have all the data. Let's check the nodes */
 
-    if (ac->cur_frame > 0 || ac->asn1_stack[0]->id.ptr != NULL) {
+    if (ac->cur_frame > 0 || (ac->asn1_stack[0] != NULL && ac->asn1_stack[0]->id.ptr != NULL)) {
         /* We spect at least one node */
         uint16_t n_iter = 0;
         ret = 0;