From 16fdb11bc3bb23a2fd645a24a7ba56d9708960ff Mon Sep 17 00:00:00 2001 From: Richard Mudgett Date: Wed, 8 Feb 2017 14:27:18 -0600 Subject: core: Cleanup some channel snapshot staging anomalies. We shouldn't unlock the channel after starting a snapshot staging because another thread may interfere and do its own snapshot staging. * app_dial.c:dial_exec_full() made hold the channel lock while setting up the outgoing channel staging. Made hold the channel lock after the called party answers while updating the caller channel staging. * chan_sip.c:sip_new() completed the channel staging on off-nominal exit. Also we need to use ast_hangup() instead of ast_channel_unref() at that location. * channel.c:__ast_channel_alloc_ap() added a comment about not needing to complete the channel snapshot staging on off-nominal exit paths. * rtp_engine.c:ast_rtp_instance_set_stats_vars() made hold the channel locks while staging the channels for the stats channel variables. Change-Id: Iefb6336893163f6447bad65568722ad5d5d8212a --- main/channel.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) (limited to 'main/channel.c') diff --git a/main/channel.c b/main/channel.c index 234919336..992c94086 100644 --- a/main/channel.c +++ b/main/channel.c @@ -823,7 +823,12 @@ __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char ast_channel_stage_snapshot(tmp); if (!(nativeformats = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) { - /* format capabilities structure allocation failure */ + /* + * Aborting the channel creation. We do not need to complete staging + * the channel snapshot because the channel has not been finalized or + * linked into the channels container yet. Nobody else knows about + * this channel nor will anybody ever know about it. + */ return ast_channel_unref(tmp); } ast_format_cap_append(nativeformats, ast_format_none, 0); @@ -849,6 +854,7 @@ __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char if (!(schedctx = ast_sched_context_create())) { ast_log(LOG_WARNING, "Channel allocation failed: Unable to create schedule context\n"); + /* See earlier channel creation abort comment above. */ return ast_channel_unref(tmp); } ast_channel_sched_set(tmp, schedctx); @@ -863,6 +869,7 @@ __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char ast_channel_caller(tmp)->id.name.valid = 1; ast_channel_caller(tmp)->id.name.str = ast_strdup(cid_name); if (!ast_channel_caller(tmp)->id.name.str) { + /* See earlier channel creation abort comment above. */ return ast_channel_unref(tmp); } } @@ -870,6 +877,7 @@ __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char ast_channel_caller(tmp)->id.number.valid = 1; ast_channel_caller(tmp)->id.number.str = ast_strdup(cid_num); if (!ast_channel_caller(tmp)->id.number.str) { + /* See earlier channel creation abort comment above. */ return ast_channel_unref(tmp); } } @@ -883,6 +891,7 @@ __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char } if (needqueue && ast_channel_internal_alertpipe_init(tmp)) { + /* See earlier channel creation abort comment above. */ return ast_channel_unref(tmp); } @@ -974,20 +983,14 @@ __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char if (assignedids && (does_id_conflict(assignedids->uniqueid) || does_id_conflict(assignedids->uniqueid2))) { ast_channel_internal_errno_set(AST_CHANNEL_ERROR_ID_EXISTS); ao2_unlock(channels); - /* This is a bit unorthodox, but we can't just call ast_channel_stage_snapshot_done() - * because that will result in attempting to publish the channel snapshot. That causes - * badness in some places, such as CDRs. So we need to manually clear the flag on the - * channel that says that a snapshot is being cleared. - */ - ast_clear_flag(ast_channel_flags(tmp), AST_FLAG_SNAPSHOT_STAGE); ast_channel_unlock(tmp); + /* See earlier channel creation abort comment above. */ return ast_channel_unref(tmp); } + /* Finalize and link into the channels container. */ ast_channel_internal_finalize(tmp); - ast_atomic_fetchadd_int(&chancount, +1); - ao2_link_flags(channels, tmp, OBJ_NOLOCK); ao2_unlock(channels); -- cgit v1.2.3