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core_local: local channel data not being properly unref'ed and unlocked

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In an earlier version of Asterisk a local channel [un]lock all functions were
added in order to keep a crash from occurring when a channel hung up too early
during an attended transfer. Unfortunately, when a transfer failure occurs and
depending on the timing, the local channels sometime do not get properly
unlocked and deref'ed after being locked and ref'ed. This happens because the
underlying local channel structure gets NULLed out before unlocking.

This patch reworks those [un]lock functions and makes sure the values that get
locked and ref'ed later get unlocked and deref'ed.

ASTERISK-27074 #close

Change-Id: Ice96653e29bd9d6674ed5f95feb6b448ab148b09
This commit is contained in:
Kevin Harwell
2017-06-20 16:05:08 -05:00
parent 0c0d69d4f3
commit 27dae55fb6
3 changed files with 42 additions and 44 deletions
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7
main/bridge.c
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@@ -4276,14 +4276,15 @@ static enum ast_transfer_result attended_transfer_bridge(struct ast_channel *cha
BRIDGE_LOCK_ONE_OR_BOTH(bridge1, bridge2);
if (bridge2) {
void *tech;
struct ast_channel *locals[2];
/* Have to lock everything just in case a hangup comes in early */
ast_local_lock_all(local_chan, &locals[0], &locals[1]);
ast_local_lock_all(local_chan, &tech, &locals[0], &locals[1]);
if (!locals[0] || !locals[1]) {
ast_log(LOG_ERROR, "Transfer failed probably due to an early hangup - "
"missing other half of '%s'\n", ast_channel_name(local_chan));
ast_local_unlock_all(local_chan);
ast_local_unlock_all(tech, locals[0], locals[1]);
ao2_cleanup(local_chan);
return AST_BRIDGE_TRANSFER_FAIL;
}
@@ -4294,7 +4295,7 @@ static enum ast_transfer_result attended_transfer_bridge(struct ast_channel *cha
}
ast_attended_transfer_message_add_link(transfer_msg, locals);
ast_local_unlock_all(local_chan);
ast_local_unlock_all(tech, locals[0], locals[1]);
} else {
ast_attended_transfer_message_add_app(transfer_msg, app, local_chan);
}