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Fix crash when removing connection from the pool - #347
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BewareMyPower merged 1 commit intoNov 17, 2023
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Demogorgon314, RobertIndie, merlimat and shibdNovember 16, 2023 04:32
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More context: https://stackoverflow.com/questions/16267615/is-second-defined-for-iterator-stdmapend Dereferencing an iterator that points to the end of a STL container is UB. |
Fixesapache#346 ### Motivation apache#336 changes the key of the `ClientConnection` in `ConnectionPool`, while in `ClientConnection::close`, it still passes the old key (logical address) to `ConnectionPool::remove`, which results in the connection could never be removed and destroyed until being deleted as a stale connection. What's worse, if the key does not exist, the iterator returned by `std::map::find` will still be dereferenced, which might cause crash in some platforms. See https://github.com/apache/pulsar-client-cpp/blob/8d32fd254e294d1fabba73aed70115a434b341ef/lib/ConnectionPool.cc#L122-L123 ### Modifications - Avoid dereferencing the iterator if it's invalid in `ConnectionPool::remove`. - Store the key suffix in `ClientConnection` and pass the correct key to `ConnectionPool::remove` in `ClientConnection::close` - Add `ClientTest.testConnectionClose` to verify `ClientConnection::close` can remove itself from the pool and the connection will be destroyed eventually.
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Fixes#346 ### Motivation #336 changes the key of the `ClientConnection` in `ConnectionPool`, while in `ClientConnection::close`, it still passes the old key (logical address) to `ConnectionPool::remove`, which results in the connection could never be removed and destroyed until being deleted as a stale connection. What's worse, if the key does not exist, the iterator returned by `std::map::find` will still be dereferenced, which might cause crash in some platforms. See https://github.com/apache/pulsar-client-cpp/blob/8d32fd254e294d1fabba73aed70115a434b341ef/lib/ConnectionPool.cc#L122-L123 ### Modifications - Avoid dereferencing the iterator if it's invalid in `ConnectionPool::remove`. - Store the key suffix in `ClientConnection` and pass the correct key to `ConnectionPool::remove` in `ClientConnection::close` - Add `ClientTest.testConnectionClose` to verify `ClientConnection::close` can remove itself from the pool and the connection will be destroyed eventually. (cherry picked from commit 6d47e94)
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Fixes#346
Motivation
#336 changes the key of the
ClientConnectioninConnectionPool, while inClientConnection::close, it still passes the old key (logical address) toConnectionPool::remove, which results in the connection could never be removed and destroyed until being deleted as a stale connection.What's worse, if the key does not exist, the iterator returned by
std::map::findwill still be dereferenced, which might cause crash in some platforms. Seepulsar-client-cpp/lib/ConnectionPool.cc
Lines 122 to 123 in 8d32fd2
Modifications
ConnectionPool::remove.ClientConnectionand pass the correct key toConnectionPool::removeinClientConnection::closeClientTest.testConnectionCloseto verifyClientConnection::closecan remove itself from the pool and the connection will be destroyed eventually.