From 7231be0785009cb17581822f0765985eb7bdb243 Mon Sep 17 00:00:00 2001
From: Daniel-Constantin Mierla <miconda@gmail.com>
Date: Wed, 14 Apr 2021 12:52:58 +0200
Subject: [PATCH] seas: check when walking the list

---
 src/modules/seas/seas_action.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/modules/seas/seas_action.c b/src/modules/seas/seas_action.c
index cd62848ab02..83be6307d04 100644
--- a/src/modules/seas/seas_action.c
+++ b/src/modules/seas/seas_action.c
@@ -1329,8 +1329,12 @@ int extract_allowed_headers(struct sip_msg *my_msg,int strip_top_vias,int allow_
 	 }else{
 	    assert(rtcnt>0);
 	    rb=hf->parsed;
-	    while(--rtcnt)
+	    while(rb && --rtcnt)
 	       rb=rb->next;
+		if(!rb) {
+			LM_ERR("no rr\n");
+			goto error;
+		}
 	    k= (((rb->nameaddr.name.s) + rb->len)-hf->name.s) ;
 	    if(len+k+CRLF_LEN<headers_len){
 	       memcpy(headers+len,hf->name.s,k);