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Bridge core: Pass a ref with the swap channel when joining a bridge.

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When code imparts a channel into a bridge to swap with another channel, a
ref needs to be held on the swap channel to ensure that it cannot
dissapear before finding it in the bridge.

* The ast_bridge_join() swap channel parameter now always steals a ref for
the swap channel.  This is the only change to the bridge framework's
public API semantics.

* bridge_channel_internal_join() now requires the bridge_channel->swap
channel to pass in a ref.

ASTERISK-24649
Reported by: John Bigelow

Review: https://reviewboard.asterisk.org/r/4354/
........

Merged revisions 430975 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@430976 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2015-01-22 19:30:12 +00:00
parent e67ca431ee
commit 9bff4eeca3
5 changed files with 54 additions and 11 deletions
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13
main/bridge_channel.c
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@@ -2490,11 +2490,11 @@ static void bridge_channel_event_join_leave(struct ast_bridge_channel *bridge_ch
ao2_iterator_destroy(&iter);
}
/*! \brief Join a channel to a bridge and handle anything the bridge may want us to do */
int bridge_channel_internal_join(struct ast_bridge_channel *bridge_channel)
{
int res = 0;
struct ast_bridge_features *channel_features;
struct ast_channel *swap;
ast_debug(1, "Bridge %s: %p(%s) is joining\n",
bridge_channel->bridge->uniqueid,
@@ -2538,6 +2538,9 @@ int bridge_channel_internal_join(struct ast_bridge_channel *bridge_channel)
bridge_channel->bridge->callid = ast_read_threadstorage_callid();
}
/* Take the swap channel ref from the bridge_channel struct. */
swap = bridge_channel->swap;
if (bridge_channel_internal_push(bridge_channel)) {
int cause = bridge_channel->bridge->cause;
@@ -2563,6 +2566,11 @@ int bridge_channel_internal_join(struct ast_bridge_channel *bridge_channel)
}
ast_bridge_unlock(bridge_channel->bridge);
/* Must release any swap ref after unlocking the bridge. */
ao2_t_cleanup(swap, "Bridge push with swap successful");
swap = NULL;
bridge_channel_event_join_leave(bridge_channel, AST_BRIDGE_HOOK_TYPE_JOIN);
while (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
@@ -2583,6 +2591,9 @@ int bridge_channel_internal_join(struct ast_bridge_channel *bridge_channel)
ast_bridge_unlock(bridge_channel->bridge);
/* Must release any swap ref after unlocking the bridge. */
ao2_t_cleanup(swap, "Bridge push with swap failed or exited immediately");
/* Complete any active hold before exiting the bridge. */
if (ast_channel_hold_state(bridge_channel->chan) == AST_CONTROL_HOLD) {
ast_debug(1, "Channel %s simulating UNHOLD for bridge end.\n",