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Commitb714bc4

Etsuro Fujita

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Fix WaitEventSet resource leak in WaitLatchOrSocket().

This function would have the same issue we solved in commit501cfd0:If an error is thrown after calling CreateWaitEventSet(), the filedescriptor (on epoll- or kqueue-based systems) or handles (on Windows)that the WaitEventSet contains are leaked.Like that commit, use PG_TRY-PG_FINALLY (PG_TRY-PG_CATCH in v12) to makesure the WaitEventSet is freed properly.Back-patch to all supported versions, but as we do not have this issuein HEAD (cf. commit50c67c2), no need to apply this patch to it.Discussion:https://postgr.es/m/CAPmGK16MqdDoD8oatp8SQWaEa4vS3nfQqDN_Sj9YRuu5J3Lj9g%40mail.gmail.com

1 parentdc5824a commitb714bc4Copy full SHA for b714bc4

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+38

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src/backend/storage/ipc
- latch.c

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+38

-32

lines changed

`‎src/backend/storage/ipc/latch.c`

Lines changed: 38 additions & 32 deletions

Original file line number	Diff line number	Diff line change
`@@ -526,48 +526,54 @@ WaitLatchOrSocket(Latch *latch, int wakeEvents, pgsocket sock,`
`526`	`526`	`WaitEventevent;`
`527`	`527`	`WaitEventSet*set=CreateWaitEventSet(CurrentMemoryContext,3);`
`528`	`528`
`529`		`-if (wakeEvents&WL_TIMEOUT)`
`530`		`-Assert(timeout >=0);`
`531`		`-else`
`532`		`-timeout=-1;`
	`529`	`+PG_TRY();`
	`530`	`+{`
	`531`	`+if (wakeEvents&WL_TIMEOUT)`
	`532`	`+Assert(timeout >=0);`
	`533`	`+else`
	`534`	`+timeout=-1;`
`533`	`535`
`534`		`-if (wakeEvents&WL_LATCH_SET)`
`535`		`-AddWaitEventToSet(set,WL_LATCH_SET,PGINVALID_SOCKET,`
`536`		`-latch,NULL);`
	`536`	`+if (wakeEvents&WL_LATCH_SET)`
	`537`	`+AddWaitEventToSet(set,WL_LATCH_SET,PGINVALID_SOCKET,`
	`538`	`+latch,NULL);`
`537`	`539`
`538`		`-/* Postmaster-managed callers must handle postmaster death somehow. */`
`539`		`-Assert(!IsUnderPostmaster\|\|`
`540`		`- (wakeEvents&WL_EXIT_ON_PM_DEATH)\|\|`
`541`		`- (wakeEvents&WL_POSTMASTER_DEATH));`
	`540`	`+/* Postmaster-managed callers must handle postmaster death somehow. */`
	`541`	`+Assert(!IsUnderPostmaster\|\|`
	`542`	`+ (wakeEvents&WL_EXIT_ON_PM_DEATH)\|\|`
	`543`	`+ (wakeEvents&WL_POSTMASTER_DEATH));`
`542`	`544`
`543`		`-if ((wakeEvents&WL_POSTMASTER_DEATH)&&IsUnderPostmaster)`
`544`		`-AddWaitEventToSet(set,WL_POSTMASTER_DEATH,PGINVALID_SOCKET,`
`545`		`-NULL,NULL);`
	`545`	`+if ((wakeEvents&WL_POSTMASTER_DEATH)&&IsUnderPostmaster)`
	`546`	`+AddWaitEventToSet(set,WL_POSTMASTER_DEATH,PGINVALID_SOCKET,`
	`547`	`+NULL,NULL);`
`546`	`548`
`547`		`-if ((wakeEvents&WL_EXIT_ON_PM_DEATH)&&IsUnderPostmaster)`
`548`		`-AddWaitEventToSet(set,WL_EXIT_ON_PM_DEATH,PGINVALID_SOCKET,`
`549`		`-NULL,NULL);`
	`549`	`+if ((wakeEvents&WL_EXIT_ON_PM_DEATH)&&IsUnderPostmaster)`
	`550`	`+AddWaitEventToSet(set,WL_EXIT_ON_PM_DEATH,PGINVALID_SOCKET,`
	`551`	`+NULL,NULL);`
`550`	`552`
`551`		`-if (wakeEvents&WL_SOCKET_MASK)`
`552`		`-{`
`553`		`-intev;`
	`553`	`+if (wakeEvents&WL_SOCKET_MASK)`
	`554`	`+{`
	`555`	`+intev;`
`554`	`556`
`555`		`-ev=wakeEvents&WL_SOCKET_MASK;`
`556`		`-AddWaitEventToSet(set,ev,sock,NULL,NULL);`
`557`		`-}`
	`557`	`+ev=wakeEvents&WL_SOCKET_MASK;`
	`558`	`+AddWaitEventToSet(set,ev,sock,NULL,NULL);`
	`559`	`+}`
`558`	`560`
`559`		`-rc=WaitEventSetWait(set,timeout,&event,1,wait_event_info);`
	`561`	`+rc=WaitEventSetWait(set,timeout,&event,1,wait_event_info);`
`560`	`562`
`561`		`-if (rc==0)`
`562`		`-ret \|=WL_TIMEOUT;`
`563`		`-else`
	`563`	`+if (rc==0)`
	`564`	`+ret \|=WL_TIMEOUT;`
	`565`	`+else`
	`566`	`+{`
	`567`	`+ret \|=event.events& (WL_LATCH_SET \|`
	`568`	`+WL_POSTMASTER_DEATH \|`
	`569`	`+WL_SOCKET_MASK);`
	`570`	`+}`
	`571`	`+}`
	`572`	`+PG_FINALLY();`
`564`	`573`	`{`
`565`		`-ret \|=event.events& (WL_LATCH_SET \|`
`566`		`-WL_POSTMASTER_DEATH \|`
`567`		`-WL_SOCKET_MASK);`
	`574`	`+FreeWaitEventSet(set);`
`568`	`575`	`}`
`569`		`-`
`570`		`-FreeWaitEventSet(set);`
	`576`	`+PG_END_TRY();`
`571`	`577`
`572`	`578`	`returnret;`
`573`	`579`	`}`

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`‎src/backend/storage/ipc/latch.c`

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