[Asterisk-code-review] app queue: Crash when transferring (asterisk[master])

[Kevin Harwell]

Kevin Harwell has uploaded a new change for review.

  https://gerrit.asterisk.org/1273

Change subject: app_queue: Crash when transferring
......................................................................

app_queue: Crash when transferring

During some transfer scenarios involving queues Asterisk would sometimes
crash when trying to obtain a channel snapshot (could happen on caller or
member channels). This occurred because the underlying channel had already
disappeared when trying to obtain the latest snapshot.

This patch adds a reference to both the member and caller channels that
extends to the lifetime of the queue'd call, thus making sure the channels
will always exist when retrieving the latest snapshots.

ASTERISK-25185 #close
Reported by: Etienne Lessard

Change-Id: Ic397fa68fb4ff35fbc378e745da9246a7b552128
---
M apps/app_queue.c
1 file changed, 17 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/73/1273/1

diff --git a/apps/app_queue.c b/apps/app_queue.c
index bb3ec17..cd9f5b0 100644
--- a/apps/app_queue.c
+++ b/apps/app_queue.c
@@ -5582,6 +5582,10 @@
 	struct local_optimization caller_optimize;
 	/*! Local channel optimization details for the member */
 	struct local_optimization member_optimize;
+	/*! Member channel */
+	struct ast_channel *member_channel;
+	/*! Caller channel */
+	struct ast_channel *caller_channel;
 };
 
 /*!
@@ -5599,6 +5603,9 @@
 	ao2_cleanup(queue_data->member);
 	queue_unref(queue_data->queue);
 	ast_string_field_free_memory(queue_data);
+
+	ao2_ref(queue_data->member_channel, -1);
+	ao2_ref(queue_data->caller_channel, -1);
 }
 
 /*!
@@ -5645,6 +5652,16 @@
 	queue_data->caller_pos = qe->opos;
 	ao2_ref(mem, +1);
 	queue_data->member = mem;
+
+	/*
+	 * During transfers it's possible for both the member and/or caller
+	 * channel(s) to not be available. Adding a reference here ensures
+	 * that the channels remain until app_queue is completely done with
+	 * them.
+	 */
+	queue_data->member_channel = ao2_bump(peer);
+	queue_data->caller_channel = ao2_bump(qe->chan);
+
 	return queue_data;
 }
 

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ic397fa68fb4ff35fbc378e745da9246a7b552128
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Owner: Kevin Harwell <kharwell at digium.com>