Don't try to queue up hold/unhold frames on a non-existent channel.

Issue 10276.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@76620 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_skinny.c

@@ -2864,6 +2864,10 @@ static int skinny_hold(struct skinny_subchannel *sub)
 	struct skinnysession *s = d->session;
 	struct skinny_req *req;
 
+	/* Don't try to hold a channel that doesn't exist */
+	if (!sub || !sub->owner)
+		return 0;
+
 	/* Channel needs to be put on hold */
 	if (skinnydebug)
 		ast_verbose("Putting on Hold(%d)\n", l->instance);
@@ -2904,6 +2908,10 @@ static int skinny_unhold(struct skinny_subchannel *sub)
 	struct skinnysession *s = d->session;
 	struct skinny_req *req;
 
+	/* Don't try to unhold a channel that doesn't exist */
+	if (!sub || !sub->owner)
+		return 0;
+
 	/* Channel is on hold, so we will unhold */
 	if (skinnydebug)
 		ast_verbose("Taking off Hold(%d)\n", l->instance);