From d418e991eeabc1e7af078b02c6cf163a3121e65c Mon Sep 17 00:00:00 2001 From: Mark Michelson Date: Fri, 12 Jul 2013 21:01:51 +0000 Subject: Prevent potential race condition in multiparty basic bridges. For more details about the race condition see the linked review at the bottom of this commit (closes issue ASTERISK-21882) Reported by Matt Jordan Review: https://reviewboard.asterisk.org/r/2663 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@394232 65c4cc65-6c06-0410-ace0-fbb531ad65f3 --- main/bridging_basic.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) (limited to 'main') diff --git a/main/bridging_basic.c b/main/bridging_basic.c index c1c0045a6..844ff3cbd 100644 --- a/main/bridging_basic.c +++ b/main/bridging_basic.c @@ -99,9 +99,16 @@ struct ast_flags *ast_bridge_features_ds_get(struct ast_channel *chan) */ static int basic_hangup_hook(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, void *hook_pvt) { -/* BUGBUG Race condition. If all parties but one hangup at the same time, the bridge may not be dissolved on the remaining party. */ + int bridge_count = 0; + struct ast_bridge_channel *iter; + ast_bridge_channel_lock_bridge(bridge_channel); - if (2 < bridge_channel->bridge->num_channels) { + AST_LIST_TRAVERSE(&bridge->channels, iter, entry) { + if (iter != bridge_channel && iter->state == AST_BRIDGE_CHANNEL_STATE_WAIT) { + ++bridge_count; + } + } + if (2 <= bridge_count) { /* Just allow this channel to leave the multi-party bridge. */ ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_HANGUP); } -- cgit v1.2.3