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Commite79ceaf

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 parent574c7c7 commite79ceafCopy full SHA for e79ceaf

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1 file changed

+38

-32

lines changed

src/backend/storage/ipc
- latch.c

1 file changed

+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
`@@ -545,48 +545,54 @@ WaitLatchOrSocket(Latch *latch, int wakeEvents, pgsocket sock,`
`545`	`545`	`WaitEventevent;`
`546`	`546`	`WaitEventSet*set=CreateWaitEventSet(CurrentMemoryContext,3);`
`547`	`547`
`548`		`-if (wakeEvents&WL_TIMEOUT)`
`549`		`-Assert(timeout >=0);`
`550`		`-else`
`551`		`-timeout=-1;`
	`548`	`+PG_TRY();`
	`549`	`+{`
	`550`	`+if (wakeEvents&WL_TIMEOUT)`
	`551`	`+Assert(timeout >=0);`
	`552`	`+else`
	`553`	`+timeout=-1;`
`552`	`554`
`553`		`-if (wakeEvents&WL_LATCH_SET)`
`554`		`-AddWaitEventToSet(set,WL_LATCH_SET,PGINVALID_SOCKET,`
`555`		`-latch,NULL);`
	`555`	`+if (wakeEvents&WL_LATCH_SET)`
	`556`	`+AddWaitEventToSet(set,WL_LATCH_SET,PGINVALID_SOCKET,`
	`557`	`+latch,NULL);`
`556`	`558`
`557`		`-/* Postmaster-managed callers must handle postmaster death somehow. */`
`558`		`-Assert(!IsUnderPostmaster\|\|`
`559`		`- (wakeEvents&WL_EXIT_ON_PM_DEATH)\|\|`
`560`		`- (wakeEvents&WL_POSTMASTER_DEATH));`
	`559`	`+/* Postmaster-managed callers must handle postmaster death somehow. */`
	`560`	`+Assert(!IsUnderPostmaster\|\|`
	`561`	`+ (wakeEvents&WL_EXIT_ON_PM_DEATH)\|\|`
	`562`	`+ (wakeEvents&WL_POSTMASTER_DEATH));`
`561`	`563`
`562`		`-if ((wakeEvents&WL_POSTMASTER_DEATH)&&IsUnderPostmaster)`
`563`		`-AddWaitEventToSet(set,WL_POSTMASTER_DEATH,PGINVALID_SOCKET,`
`564`		`-NULL,NULL);`
	`564`	`+if ((wakeEvents&WL_POSTMASTER_DEATH)&&IsUnderPostmaster)`
	`565`	`+AddWaitEventToSet(set,WL_POSTMASTER_DEATH,PGINVALID_SOCKET,`
	`566`	`+NULL,NULL);`
`565`	`567`
`566`		`-if ((wakeEvents&WL_EXIT_ON_PM_DEATH)&&IsUnderPostmaster)`
`567`		`-AddWaitEventToSet(set,WL_EXIT_ON_PM_DEATH,PGINVALID_SOCKET,`
`568`		`-NULL,NULL);`
	`568`	`+if ((wakeEvents&WL_EXIT_ON_PM_DEATH)&&IsUnderPostmaster)`
	`569`	`+AddWaitEventToSet(set,WL_EXIT_ON_PM_DEATH,PGINVALID_SOCKET,`
	`570`	`+NULL,NULL);`
`569`	`571`
`570`		`-if (wakeEvents&WL_SOCKET_MASK)`
`571`		`-{`
`572`		`-intev;`
	`572`	`+if (wakeEvents&WL_SOCKET_MASK)`
	`573`	`+{`
	`574`	`+intev;`
`573`	`575`
`574`		`-ev=wakeEvents&WL_SOCKET_MASK;`
`575`		`-AddWaitEventToSet(set,ev,sock,NULL,NULL);`
`576`		`-}`
	`576`	`+ev=wakeEvents&WL_SOCKET_MASK;`
	`577`	`+AddWaitEventToSet(set,ev,sock,NULL,NULL);`
	`578`	`+}`
`577`	`579`
`578`		`-rc=WaitEventSetWait(set,timeout,&event,1,wait_event_info);`
	`580`	`+rc=WaitEventSetWait(set,timeout,&event,1,wait_event_info);`
`579`	`581`
`580`		`-if (rc==0)`
`581`		`-ret \|=WL_TIMEOUT;`
`582`		`-else`
	`582`	`+if (rc==0)`
	`583`	`+ret \|=WL_TIMEOUT;`
	`584`	`+else`
	`585`	`+{`
	`586`	`+ret \|=event.events& (WL_LATCH_SET \|`
	`587`	`+WL_POSTMASTER_DEATH \|`
	`588`	`+WL_SOCKET_MASK);`
	`589`	`+}`
	`590`	`+}`
	`591`	`+PG_FINALLY();`
`583`	`592`	`{`
`584`		`-ret \|=event.events& (WL_LATCH_SET \|`
`585`		`-WL_POSTMASTER_DEATH \|`
`586`		`-WL_SOCKET_MASK);`
	`593`	`+FreeWaitEventSet(set);`
`587`	`594`	`}`
`588`		`-`
`589`		`-FreeWaitEventSet(set);`
	`595`	`+PG_END_TRY();`
`590`	`596`
`591`	`597`	`returnret;`
`592`	`598`	`}`

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Commite79ceaf

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`‎src/backend/storage/ipc/latch.c`

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