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Commite13ac55

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Avoid possible crash in contrib/bloom's blendscan().

It's possible to begin and end an indexscan without ever callingamrescan. contrib/bloom, unlike every other index AM, allocatedits "scan->opaque" storage at amrescan time, and thus would crashin amendscan if amrescan hadn't been called. We could fix thisby putting in a null-pointer check in blendscan, but I see no verygood reason why contrib/bloom should march to its own drummer inthis respect. Let's move that initialization to blbeginscaninstead. Per report from Jeff Janes.

1 parent7c979c9 commite13ac55Copy full SHA for e13ac55

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contrib/bloom
- blscan.c

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`‎contrib/bloom/blscan.c‎`

Lines changed: 10 additions & 16 deletions

Original file line number	Diff line number	Diff line change
`@@ -29,9 +29,16 @@ IndexScanDesc`
`29`	`29`	`blbeginscan(Relationr,intnkeys,intnorderbys)`
`30`	`30`	`{`
`31`	`31`	`IndexScanDescscan;`
	`32`	`+BloomScanOpaqueso;`
`32`	`33`
`33`	`34`	`scan=RelationGetIndexScan(r,nkeys,norderbys);`
`34`	`35`
	`36`	`+so= (BloomScanOpaque)palloc(sizeof(BloomScanOpaqueData));`
	`37`	`+initBloomState(&so->state,scan->indexRelation);`
	`38`	`+so->sign=NULL;`
	`39`	`+`
	`40`	`+scan->opaque=so;`
	`41`	`+`
`35`	`42`	`returnscan;`
`36`	`43`	`}`
`37`	`44`
`@@ -42,23 +49,10 @@ void`
`42`	`49`	`blrescan(IndexScanDescscan,ScanKeyscankey,intnscankeys,`
`43`	`50`	`ScanKeyorderbys,intnorderbys)`
`44`	`51`	`{`
`45`		`-BloomScanOpaqueso;`
`46`		`-`
`47`		`-so= (BloomScanOpaque)scan->opaque;`
`48`		`-`
`49`		`-if (so==NULL)`
`50`		`-{`
`51`		`-/* if called from blbeginscan */`
`52`		`-so= (BloomScanOpaque)palloc(sizeof(BloomScanOpaqueData));`
`53`		`-initBloomState(&so->state,scan->indexRelation);`
`54`		`-scan->opaque=so;`
	`52`	`+BloomScanOpaqueso= (BloomScanOpaque)scan->opaque;`
`55`	`53`
`56`		`-}`
`57`		`-else`
`58`		`-{`
`59`		`-if (so->sign)`
`60`		`-pfree(so->sign);`
`61`		`-}`
	`54`	`+if (so->sign)`
	`55`	`+pfree(so->sign);`
`62`	`56`	`so->sign=NULL;`
`63`	`57`
`64`	`58`	`if (scankey&&scan->numberOfKeys>0)`

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Commite13ac55

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`‎contrib/bloom/blscan.c‎`

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