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Fix core dump in QTNodeCompare when tsquery_cmp() is applied to two empty

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tsqueries.  CompareTSQ has to have a guard for the case rather than blindly
applying QTNodeCompare to random data past the end of the datums.  Also,
change QTNodeCompare to be a little less trusting: use an actual test rather
than just Assert'ing that the input is sane.  Problem encountered while
investigating another issue (I saw a core dump in autoanalyze on a table
containing multiple empty tsquery values).

Back-patch to all branches with tsquery support.

In HEAD, also fix some bizarre (though not outright wrong) coding in
tsq_mcontains().
This commit is contained in:
Tom Lane 2010-08-03 00:10:52 +00:00
parent c472e780a3
commit 9f4b99afbb
2 changed files with 9 additions and 6 deletions
src/backend/utils/adt
tsquery_op.ctsquery_util.c

4
src/backend/utils/adt/tsquery_op.c

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/tsquery_op.c,v 1.6 2009/06/11 14:49:04 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/tsquery_op.c,v 1.6.2.1 2010/08/03 00:10:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -149,7 +149,7 @@ CompareTSQ(TSQuery a, TSQuery b)
{
return (VARSIZE(a) < VARSIZE(b)) ? -1 : 1;
}
else
else if (a->size != 0)
{
QTNode *an = QT2QTN(GETQUERY(a), GETOPERAND(a));
QTNode *bn = QT2QTN(GETQUERY(b), GETOPERAND(b));

11
src/backend/utils/adt/tsquery_util.c

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/tsquery_util.c,v 1.11 2009/06/11 14:49:04 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/tsquery_util.c,v 1.11.2.1 2010/08/03 00:10:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -113,13 +113,11 @@ QTNodeCompare(QTNode *an, QTNode *bn)
}
return 0;
}
else
else if (an->valnode->type == QI_VAL)
{
QueryOperand *ao = &an->valnode->operand;
QueryOperand *bo = &bn->valnode->operand;
Assert(an->valnode->type == QI_VAL);
if (ao->valcrc != bo->valcrc)
{
return (ao->valcrc > bo->valcrc) ? -1 : 1;
@ -127,6 +125,11 @@ QTNodeCompare(QTNode *an, QTNode *bn)
return tsCompareString(an->word, ao->length, bn->word, bo->length, false);
}
else
{
elog(ERROR, "unrecognized QueryItem type: %d", an->valnode->type);
return 0; /* keep compiler quiet */
}
}
static int