Fix crash when moving audiohooks between channels.

Handle the scenario where we are called to move audiohooks between channels
and the source channel does not actually have any on it.

(closes issue #14734)
Reported by: corruptor

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@185196 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/audiohook.c b/main/audiohook.c
index cd5b7ca8a83a3c55198cfee92a232f886e25d6f0..fdd241db2ce950089edfd156eea5d4e3c99b8dae 100644 (file)
--- a/main/audiohook.c
+++ b/main/audiohook.c
@@ -453,12 +453,12 @@ static struct ast_audiohook *find_audiohook_by_source(struct ast_audiohook_list
 
 void ast_audiohook_move_by_source (struct ast_channel *old_chan, struct ast_channel *new_chan, const char *source)
 {
-       struct ast_audiohook *audiohook = find_audiohook_by_source(old_chan->audiohooks, source);
+       struct ast_audiohook *audiohook;
 
-       if (!audiohook) {
+       if (!old_chan->audiohooks || !(audiohook = find_audiohook_by_source(old_chan->audiohooks, source))) {
                return;
        }
-       
+
        /* By locking both channels and the audiohook, we can assure that
         * another thread will not have a chance to read the audiohook's status
         * as done, even though ast_audiohook_remove signals the trigger