From 4f077691bca39763cc0b6bf304de588068244c73 Mon Sep 17 00:00:00 2001
From: Russell Bryant <russell@russellbryant.com>
Date: Tue, 9 Sep 2008 15:44:10 +0000
Subject: [PATCH] Merged revisions 142063 via svnmerge from
 https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r142063 | russell | 2008-09-09 10:40:24 -0500 (Tue, 09 Sep 2008) | 5 lines

Ensure that the stored CDR reference is still valid after the bridge before
poking at it.  Also, keep the channel locked while messing with this CDR.

(fixes crashes reported in issue #13409)

........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@142064 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 main/features.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/main/features.c b/main/features.c
index b49f9c8b68..e81a24f598 100644
--- a/main/features.c
+++ b/main/features.c
@@ -2345,6 +2345,22 @@ int ast_bridge_call(struct ast_channel *chan,struct ast_channel *peer,struct ast
 			ast_cdr_specialized_reset(chan->cdr,0);
 		}
 		if (peer->cdr) {
+			struct ast_cdr *cur;
+
+			ast_channel_lock(peer);
+			for (cur = peer->cdr; cur; cur = cur->next) {
+				if (cur == orig_peer_cdr) {
+					break;
+				}
+			}
+
+			if (!cur) {
+				/* orig_peer_cdr is gone, probably because of a masquerade
+				 * during the bridge. */
+				ast_channel_unlock(peer);
+				return res;
+			}
+
 			/* before resetting the peer cdr, throw a copy of it to the 
 			   backend, just in case the cdr.conf file is calling for
 			   unanswered CDR's. */
@@ -2361,6 +2377,7 @@ int ast_bridge_call(struct ast_channel *chan,struct ast_channel *peer,struct ast
 				}
 			}
 			ast_cdr_specialized_reset(orig_peer_cdr,0);
+			ast_channel_unlock(peer);
 		}
  	}
 	return res;