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Commit01b01a7

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 parentf5cee41 commit01b01a7Copy full SHA for 01b01a7

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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
`@@ -395,48 +395,54 @@ WaitLatchOrSocket(Latch *latch, int wakeEvents, pgsocket sock,`
`395`	`395`	`WaitEventevent;`
`396`	`396`	`WaitEventSet*set=CreateWaitEventSet(CurrentMemoryContext,3);`
`397`	`397`
`398`		`-if (wakeEvents&WL_TIMEOUT)`
`399`		`-Assert(timeout >=0);`
`400`		`-else`
`401`		`-timeout=-1;`
	`398`	`+PG_TRY();`
	`399`	`+{`
	`400`	`+if (wakeEvents&WL_TIMEOUT)`
	`401`	`+Assert(timeout >=0);`
	`402`	`+else`
	`403`	`+timeout=-1;`
`402`	`404`
`403`		`-if (wakeEvents&WL_LATCH_SET)`
`404`		`-AddWaitEventToSet(set,WL_LATCH_SET,PGINVALID_SOCKET,`
`405`		`-latch,NULL);`
	`405`	`+if (wakeEvents&WL_LATCH_SET)`
	`406`	`+AddWaitEventToSet(set,WL_LATCH_SET,PGINVALID_SOCKET,`
	`407`	`+latch,NULL);`
`406`	`408`
`407`		`-/* Postmaster-managed callers must handle postmaster death somehow. */`
`408`		`-Assert(!IsUnderPostmaster\|\|`
`409`		`- (wakeEvents&WL_EXIT_ON_PM_DEATH)\|\|`
`410`		`- (wakeEvents&WL_POSTMASTER_DEATH));`
	`409`	`+/* Postmaster-managed callers must handle postmaster death somehow. */`
	`410`	`+Assert(!IsUnderPostmaster\|\|`
	`411`	`+ (wakeEvents&WL_EXIT_ON_PM_DEATH)\|\|`
	`412`	`+ (wakeEvents&WL_POSTMASTER_DEATH));`
`411`	`413`
`412`		`-if ((wakeEvents&WL_POSTMASTER_DEATH)&&IsUnderPostmaster)`
`413`		`-AddWaitEventToSet(set,WL_POSTMASTER_DEATH,PGINVALID_SOCKET,`
`414`		`-NULL,NULL);`
	`414`	`+if ((wakeEvents&WL_POSTMASTER_DEATH)&&IsUnderPostmaster)`
	`415`	`+AddWaitEventToSet(set,WL_POSTMASTER_DEATH,PGINVALID_SOCKET,`
	`416`	`+NULL,NULL);`
`415`	`417`
`416`		`-if ((wakeEvents&WL_EXIT_ON_PM_DEATH)&&IsUnderPostmaster)`
`417`		`-AddWaitEventToSet(set,WL_EXIT_ON_PM_DEATH,PGINVALID_SOCKET,`
`418`		`-NULL,NULL);`
	`418`	`+if ((wakeEvents&WL_EXIT_ON_PM_DEATH)&&IsUnderPostmaster)`
	`419`	`+AddWaitEventToSet(set,WL_EXIT_ON_PM_DEATH,PGINVALID_SOCKET,`
	`420`	`+NULL,NULL);`
`419`	`421`
`420`		`-if (wakeEvents&WL_SOCKET_MASK)`
`421`		`-{`
`422`		`-intev;`
	`422`	`+if (wakeEvents&WL_SOCKET_MASK)`
	`423`	`+{`
	`424`	`+intev;`
`423`	`425`
`424`		`-ev=wakeEvents&WL_SOCKET_MASK;`
`425`		`-AddWaitEventToSet(set,ev,sock,NULL,NULL);`
`426`		`-}`
	`426`	`+ev=wakeEvents&WL_SOCKET_MASK;`
	`427`	`+AddWaitEventToSet(set,ev,sock,NULL,NULL);`
	`428`	`+}`
`427`	`429`
`428`		`-rc=WaitEventSetWait(set,timeout,&event,1,wait_event_info);`
	`430`	`+rc=WaitEventSetWait(set,timeout,&event,1,wait_event_info);`
`429`	`431`
`430`		`-if (rc==0)`
`431`		`-ret \|=WL_TIMEOUT;`
`432`		`-else`
	`432`	`+if (rc==0)`
	`433`	`+ret \|=WL_TIMEOUT;`
	`434`	`+else`
	`435`	`+{`
	`436`	`+ret \|=event.events& (WL_LATCH_SET \|`
	`437`	`+WL_POSTMASTER_DEATH \|`
	`438`	`+WL_SOCKET_MASK);`
	`439`	`+}`
	`440`	`+}`
	`441`	`+PG_FINALLY();`
`433`	`442`	`{`
`434`		`-ret \|=event.events& (WL_LATCH_SET \|`
`435`		`-WL_POSTMASTER_DEATH \|`
`436`		`-WL_SOCKET_MASK);`
	`443`	`+FreeWaitEventSet(set);`
`437`	`444`	`}`
`438`		`-`
`439`		`-FreeWaitEventSet(set);`
	`445`	`+PG_END_TRY();`
`440`	`446`
`441`	`447`	`returnret;`
`442`	`448`	`}`

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`‎src/backend/storage/ipc/latch.c`

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