Merged revisions 168628 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r168628 | mmichelson | 2009-01-14 18:11:01 -0600 (Wed, 14 Jan 2009) | 16 lines

Fix some crashes from bad datastore handling in app_queue.c

* The queue_transfer_fixup function was searching for and removing
  the datastore from the incorrect channel, so this was fixed.

* Most datastore operations regarding the queue_transfer datastore
  were being done without the channel locked, so proper channel locking
  was added, too.

(closes issue #14086)
Reported by: ZX81
Patches:
      14086v2.patch uploaded by putnopvut (license 60)
Tested by: ZX81, festr

........

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@168629 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/apps/app_queue.c b/apps/app_queue.c
index 8a4a0e6..85d1588 100644 (file)
--- a/apps/app_queue.c
+++ b/apps/app_queue.c
@@ -3332,8 +3332,9 @@ static void queue_transfer_fixup(void *data, struct ast_channel *old_chan, struc
 
        update_queue(qe->parent, member, callcompletedinsl, (time(NULL) - callstart));
        
-       if ((datastore = ast_channel_datastore_find(new_chan, &queue_transfer_info, NULL))) {
-               ast_channel_datastore_remove(new_chan, datastore);
+       /* No need to lock the channels because they are already locked in ast_do_masquerade */
+       if ((datastore = ast_channel_datastore_find(old_chan, &queue_transfer_info, NULL))) {
+               ast_channel_datastore_remove(old_chan, datastore);
        } else {
                ast_log(LOG_WARNING, "Can't find the queue_transfer datastore.\n");
        }
@@ -3344,6 +3345,8 @@ static void queue_transfer_fixup(void *data, struct ast_channel *old_chan, struc
  * When a caller is atxferred, then the queue_transfer_info datastore
  * is removed from the channel. If it's still there after the bridge is
  * broken, then the caller was not atxferred.
+ *
+ * \note Only call this with chan locked
  */
 static int attended_transfer_occurred(struct ast_channel *chan)
 {
@@ -3667,9 +3670,11 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
         * to which the datastore was moved hangs up, it will attempt to free this
         * datastore again, causing a crash
         */
+       ast_channel_lock(qe->chan);
        if (datastore && !ast_channel_datastore_remove(qe->chan, datastore)) {
                ast_datastore_free(datastore);
        }
+       ast_channel_unlock(qe->chan);
        ao2_lock(qe->parent);
        if (qe->parent->strategy == QUEUE_STRATEGY_RRMEMORY) {
                store_next_rr(qe, outgoing);
@@ -4078,6 +4083,7 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
                /* If the queue member did an attended transfer, then the TRANSFER already was logged in the queue_log
                 * when the masquerade occurred. These other "ending" queue_log messages are unnecessary
                 */
+               ast_channel_lock(qe->chan);
                if (!attended_transfer_occurred(qe->chan)) {
                        struct ast_datastore *tds;
                        if (strcasecmp(oldcontext, qe->chan->context) || strcasecmp(oldexten, qe->chan->exten)) {
@@ -4094,17 +4100,16 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
                                        (long) (callstart - qe->start), (long) (time(NULL) - callstart), qe->opos);
                                send_agent_complete(qe, queuename, peer, member, callstart, vars, sizeof(vars), AGENT);
                        }
-                       ast_channel_lock(qe->chan);
-                       if ((tds = ast_channel_datastore_find(qe->chan, &queue_transfer_info, NULL))) {
+                       if ((tds = ast_channel_datastore_find(qe->chan, &queue_transfer_info, NULL))) { 
                                ast_channel_datastore_remove(qe->chan, tds);
                        }
-                       ast_channel_unlock(qe->chan);
                        update_queue(qe->parent, member, callcompletedinsl, (time(NULL) - callstart));
                }
 
                if (transfer_ds) {
                        ast_datastore_free(transfer_ds);
                }
+               ast_channel_unlock(qe->chan);
                ast_hangup(peer);
                res = bridge ? bridge : 1;
                ao2_ref(member, -1);