postgresql/contrib/postgres_fdw
Heikki Linnakangas 481d7d1c01 Fix resource leak when a FDW's ForeignAsyncRequest function fails
If an error is thrown after calling CreateWaitEventSet(), the memory
of a WaitEventSet is free'd as it's allocated in the short-lived
memory context, but the file descriptor (on epoll- or kqueue-based
systems) or handles (on Windows) that it contains are leaked.

Use PG_TRY-FINALLY to ensure it gets freed. (On master, I will apply a
better fix, using ResourceOwners to track the WaitEventSet, but that's
not backpatchable.)

The added test doesn't check for leaking resources, so it passed even
before this commit. But at least it covers the code path.

In the passing, fix misleading comment on what the 'nevents' argument
to WaitEventSetWait means.

Report by Alexander Lakhin, analysis and suggestion for the fix by Tom
Lane. Fixes bug #17828. Backpatch to v14 where async execution was
introduced, but master gets a different fix.

Discussion: https://www.postgresql.org/message-id/17828-122da8cba23236be@postgresql.org
Discussion: https://www.postgresql.org/message-id/472235.1678387869@sss.pgh.pa.us
2023-11-23 13:31:51 +02:00
..
expected Fix resource leak when a FDW's ForeignAsyncRequest function fails 2023-11-23 13:31:51 +02:00
sql Fix resource leak when a FDW's ForeignAsyncRequest function fails 2023-11-23 13:31:51 +02:00
.gitignore Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
Makefile postgres_fdw: Add function to list cached connections to foreign servers. 2021-01-18 15:11:08 +09:00
connection.c Rename SetSingleFuncCall() to InitMaterializedSRF() 2022-10-18 10:22:40 +09:00
deparse.c Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:48 -04:00
option.c Fix handling of escape sequences in postgres_fdw.application_name 2023-02-21 20:02:09 +09:00
postgres_fdw--1.0--1.1.sql postgres_fdw: Add functions to discard cached connections. 2021-01-26 15:35:54 +09:00
postgres_fdw--1.0.sql Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
postgres_fdw.c Fix calculation of which GENERATED columns need to be updated. 2023-01-05 14:12:17 -05:00
postgres_fdw.control postgres_fdw: Add function to list cached connections to foreign servers. 2021-01-18 15:11:08 +09:00
postgres_fdw.h Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:48 -04:00
shippable.c Update copyright for 2022 2022-01-07 19:04:57 -05:00