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Merge pull request #26953 from ClickHouse/fix-race-in-connections-collector

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Hold context in HedgedConnections to prevent use-after-free on settings.
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alexey-milovidov 2021-07-30 08:52:17 +03:00 committed by GitHub
commit 407f53b476
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3 changed files with 8 additions and 5 deletions
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8
src/Client/HedgedConnections.cpp
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@ -3,6 +3,7 @@
#include <Client/HedgedConnections.h>
#include <Common/ProfileEvents.h>
#include <Interpreters/ClientInfo.h>
#include <Interpreters/Context.h>
namespace ProfileEvents
{
@ -21,13 +22,14 @@ namespace ErrorCodes
HedgedConnections::HedgedConnections(
const ConnectionPoolWithFailoverPtr & pool_,
const Settings & settings_,
ContextPtr context_,
const ConnectionTimeouts & timeouts_,
const ThrottlerPtr & throttler_,
PoolMode pool_mode,
std::shared_ptr<QualifiedTableName> table_to_check_)
: hedged_connections_factory(pool_, &settings_, timeouts_, table_to_check_)
, settings(settings_)
: hedged_connections_factory(pool_, &context_->getSettingsRef(), timeouts_, table_to_check_)
, context(std::move(context_))
, settings(context->getSettingsRef())
, drain_timeout(settings.drain_timeout)
, allow_changing_replica_until_first_data_packet(settings.allow_changing_replica_until_first_data_packet)
, throttler(throttler_)

3
src/Client/HedgedConnections.h
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@ -72,7 +72,7 @@ public:
};
HedgedConnections(const ConnectionPoolWithFailoverPtr & pool_,
const Settings & settings_,
ContextPtr context_,
const ConnectionTimeouts & timeouts_,
const ThrottlerPtr & throttler,
PoolMode pool_mode,
@ -188,6 +188,7 @@ private:
Packet last_received_packet;
Epoll epoll;
ContextPtr context;
const Settings & settings;
/// The following two fields are from settings but can be referenced outside the lifetime of

2
src/DataStreams/RemoteQueryExecutor.cpp
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@ -102,7 +102,7 @@ RemoteQueryExecutor::RemoteQueryExecutor(
if (main_table)
table_to_check = std::make_shared<QualifiedTableName>(main_table.getQualifiedName());
return std::make_shared<HedgedConnections>(pool, current_settings, timeouts, throttler, pool_mode, table_to_check);
return std::make_shared<HedgedConnections>(pool, context, timeouts, throttler, pool_mode, table_to_check);
}
#endif