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Bug: backend crashes in btbeginscan()->btrescan()->_bt_orderkeys()

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when btree used in innerscan with run-time key which value
passed by pointer.

Fix: keys ordering stuff moved to _bt_first().

Pointed by Thomas Lockhart.
This commit is contained in:
Vadim B. Mikheev 1997-05-05 03:41:19 +00:00
parent 917abdd140
commit c3b51e0d67
2 changed files with 31 additions and 24 deletions
src/backend/access/nbtree
nbtree.cnbtsearch.c

25
src/backend/access/nbtree/nbtree.c

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.18 1997/04/18 03:37:53 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.19 1997/05/05 03:41:17 vadim Exp $
*
* NOTES
* This file contains only the public interface routines.
@ -410,7 +410,6 @@ btrescan(IndexScanDesc scan, bool fromEnd, ScanKey scankey)
{
ItemPointer iptr;
BTScanOpaque so;
StrategyNumber strat;
so = (BTScanOpaque) scan->opaque;
@ -439,10 +438,11 @@ btrescan(IndexScanDesc scan, bool fromEnd, ScanKey scankey)
scan->flags = 0x0;
}
/* reset the scan key */
/*
* Reset the scan keys. Note that keys ordering stuff
* moved to _bt_first. - vadim 05/05/97
*/
so->numberOfKeys = scan->numberOfKeys;
so->numberOfFirstKeys = 0; /* may be changed by _bt_orderkeys */
so->qual_ok = 1; /* may be changed by _bt_orderkeys */
if (scan->numberOfKeys > 0) {
memmove(scan->keyData,
scankey,
@ -450,21 +450,6 @@ btrescan(IndexScanDesc scan, bool fromEnd, ScanKey scankey)
memmove(so->keyData,
scankey,
so->numberOfKeys * sizeof(ScanKeyData));
/* order the keys in the qualification */
_bt_orderkeys(scan->relation, so);
}
/* finally, be sure that the scan exploits the tree order */
scan->scanFromEnd = false;
if ( so->numberOfKeys > 0 ) {
strat = _bt_getstrat(scan->relation, 1 /* XXX */,
so->keyData[0].sk_procedure);
if (strat == BTLessStrategyNumber
|| strat == BTLessEqualStrategyNumber)
scan->scanFromEnd = true;
} else {
scan->scanFromEnd = true;
}
}

30
src/backend/access/nbtree/nbtsearch.c

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.18 1997/04/24 15:46:44 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.19 1997/05/05 03:41:19 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -751,16 +751,38 @@ _bt_first(IndexScanDesc scan, ScanDirection dir)
ScanKeyData skdata;
Size keysok;
rel = scan->relation;
so = (BTScanOpaque) scan->opaque;
if ( so->qual_ok == 0 ) /* may be set by _bt_orderkeys */
/*
* Order the keys in the qualification and be sure
* that the scan exploits the tree order.
*/
so->numberOfFirstKeys = 0; /* may be changed by _bt_orderkeys */
so->qual_ok = 1; /* may be changed by _bt_orderkeys */
scan->scanFromEnd = false;
if ( so->numberOfKeys > 0 )
{
_bt_orderkeys(rel, so);
strat = _bt_getstrat(rel, 1, so->keyData[0].sk_procedure);
/* NOTE: it assumes ForwardScanDirection */
if ( strat == BTLessStrategyNumber ||
strat == BTLessEqualStrategyNumber )
scan->scanFromEnd = true;
}
else
scan->scanFromEnd = true;
if ( so->qual_ok == 0 )
return ((RetrieveIndexResult) NULL);
/* if we just need to walk down one edge of the tree, do that */
if (scan->scanFromEnd)
return (_bt_endpoint(scan, dir));
rel = scan->relation;
itupdesc = RelationGetTupleDescriptor(scan->relation);
itupdesc = RelationGetTupleDescriptor(rel);
current = &(scan->currentItemData);
/*