Do not assume that the bridge_cdr is still attached to the channel when the 'h' exten is finished executing.

It is possible for a masquerade operation to occur when the 'h' exten is operating. This operation moves
the CDR records around causing the bridge_cdr to no longer exist on the channel where it is expected to.
We can not safely modify it afterwards because of this, so don't even try.

(closes issue #14564)
Reported by: meric


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@179840 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_features.c

@@ -1958,8 +1958,13 @@ int ast_bridge_call(struct ast_channel *chan,struct ast_channel *peer,struct ast
 		ast_channel_lock(chan);
 		ast_copy_string(chan->exten, save_exten, sizeof(chan->exten));
 		chan->priority = save_prio;
-		if (bridge_cdr)
-			chan->cdr = swapper;
+		if (bridge_cdr) {
+			if (chan->cdr == bridge_cdr) {
+				chan->cdr = swapper;
+			} else {
+				bridge_cdr = NULL;
+			}
+		}
 		ast_set_flag(chan, AST_FLAG_BRIDGE_HANGUP_RUN);
 		ast_channel_unlock(chan);
 		/* protect the lastapp/lastdata against the effects of the hangup/dialplan code */