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Fix some crashes from bad datastore handling in app_queue.c

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* 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/branches/1.4@168628 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Michelson
2009-01-15 00:11:01 +00:00
parent 1a80fbd577
commit 26658ead16
1 changed files with 10 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
apps/app_queue.c
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@@ -2620,8 +2620,9 @@ static void queue_transfer_fixup(void *data, struct ast_channel *old_chan, struc
update_queue(qe->parent, member, callcompletedinsl);
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");
}
@@ -2632,6 +2633,8 @@ 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)
{
@@ -2906,9 +2909,11 @@ 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_channel_datastore_free(datastore);
}
ast_channel_unlock(qe->chan);
ast_mutex_lock(&qe->parent->lock);
if (qe->parent->strategy == QUEUE_STRATEGY_RRMEMORY) {
store_next(qe, outgoing);
@@ -3155,6 +3160,7 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
transfer_ds = setup_transfer_datastore(qe, member, callstart, callcompletedinsl);
bridge = ast_bridge_call(qe->chan,peer, &bridge_config);
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)) {
@@ -3195,17 +3201,16 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
(long)(time(NULL) - callstart),
qe->parent->eventwhencalled == QUEUE_EVENT_VARIABLES ? vars2manager(qe->chan, vars, sizeof(vars)) : "");
}
ast_channel_lock(qe->chan);
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);
}
if (transfer_ds) {
ast_channel_datastore_free(transfer_ds);
}
ast_channel_unlock(qe->chan);
ast_hangup(peer);
res = bridge ? bridge : 1;
ao2_ref(member, -1);