From a300034b087869effb064b5eb627ae62ef27a255 Mon Sep 17 00:00:00 2001
From: Mark Michelson <mmichelson@digium.com>
Date: Mon, 18 Feb 2008 16:37:31 +0000
Subject: [PATCH] Fix a linked list corruption that under the right
 circumstances could lead to a looped list, meaning it will traverse forever.

(closes issue #11818)
Reported by: michael-fig
Patches:
      11818.patch uploaded by putnopvut (license 60)
	  Tested by: michael-fig



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@103770 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 channels/chan_zap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index 5b755ea073..e8d9fb2aa1 100644
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -7706,7 +7706,10 @@ static struct zt_pvt *chandup(struct zt_pvt *src)
 	}
 	p->destroy = 1;
 	p->next = iflist;
+	p->prev = NULL;
 	iflist = p;
+	if (iflist->next)
+		iflist->next->prev = p;
 	return p;
 }