fix various memory leaks #1723
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fix various memory leaks #1723
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arogge
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May 17, 2024
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I gathered all the logs created by asan with our test suite. |
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arogge
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May 24, 2024
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Do you think we should backport some/all of these into 23? |
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Ill try to backport it and ill see what works. |
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PQfinish _always_ has to be called on db_handle_, if its not null: https://www.postgresql.org/docs/current/libpq-connect.html "Note that when PQconnectStart or PQconnectStartParams returns a non-null pointer, you must call PQfinish when you are finished with it, in order to dispose of the structure and any associated memory blocks. This must be done even if the connection attempt fails or is abandoned." PQexec() always allocates a new result object, that always has to be freed with PQclear()!
Instead of hunting down every place where this could get leaked, we instead use PoolMem to do so automatically.
Removing unecessary code since stifle_history() already ensures that we only have at most history_max_entries inside our history. Regardless this is a leak because remove_history returns to us a HIST_ENTRY* that we are supposed to free on our own (which we do not do!).
When an error occurs during the resource scanning, then the scanned resource is not added to any list, which means its memory is never freed. As such we free the allocated resource here but calling the appropriate callback.
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