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The macaddr opclass stores two macaddr structs (each of size 6) in an index column that's declared as being of type gbtreekey16, ie 16 bytes. In the original coding this led to passing a palloc'd value of size 12 to the index insertion code, so that data would be fetched past the end of the allocated value during index tuple construction. This makes valgrind unhappy. In principle it could result in a SIGSEGV, though with the current implementation of palloc there's no risk since the 12-byte request size would be rounded up to 16 bytes anyway. To fix, add a field to struct gbtree_ninfo showing the declared size of the index datums, and use that in the palloc requests; and use palloc0 to be sure that any wasted bytes are cleanly initialized. Per report from Andres Freund. No back-patch since there's no current risk of a real problem.
254 lines
5.8 KiB
C
254 lines
5.8 KiB
C
/*
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* contrib/btree_gist/btree_date.c
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*/
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#include "postgres.h"
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#include "btree_gist.h"
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#include "btree_utils_num.h"
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#include "utils/date.h"
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typedef struct
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{
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DateADT lower;
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DateADT upper;
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} dateKEY;
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/*
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** date ops
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*/
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PG_FUNCTION_INFO_V1(gbt_date_compress);
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PG_FUNCTION_INFO_V1(gbt_date_union);
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PG_FUNCTION_INFO_V1(gbt_date_picksplit);
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PG_FUNCTION_INFO_V1(gbt_date_consistent);
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PG_FUNCTION_INFO_V1(gbt_date_distance);
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PG_FUNCTION_INFO_V1(gbt_date_penalty);
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PG_FUNCTION_INFO_V1(gbt_date_same);
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static bool
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gbt_dategt(const void *a, const void *b)
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{
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return DatumGetBool(
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DirectFunctionCall2(date_gt, DateADTGetDatum(*((const DateADT *) a)), DateADTGetDatum(*((const DateADT *) b)))
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);
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}
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static bool
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gbt_datege(const void *a, const void *b)
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{
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return DatumGetBool(
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DirectFunctionCall2(date_ge, DateADTGetDatum(*((const DateADT *) a)), DateADTGetDatum(*((const DateADT *) b)))
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);
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}
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static bool
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gbt_dateeq(const void *a, const void *b)
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{
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return DatumGetBool(
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DirectFunctionCall2(date_eq, DateADTGetDatum(*((const DateADT *) a)), DateADTGetDatum(*((const DateADT *) b)))
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);
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}
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static bool
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gbt_datele(const void *a, const void *b)
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{
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return DatumGetBool(
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DirectFunctionCall2(date_le, DateADTGetDatum(*((const DateADT *) a)), DateADTGetDatum(*((const DateADT *) b)))
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);
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}
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static bool
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gbt_datelt(const void *a, const void *b)
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{
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return DatumGetBool(
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DirectFunctionCall2(date_lt, DateADTGetDatum(*((const DateADT *) a)), DateADTGetDatum(*((const DateADT *) b)))
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);
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}
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static int
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gbt_datekey_cmp(const void *a, const void *b)
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{
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dateKEY *ia = (dateKEY *) (((const Nsrt *) a)->t);
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dateKEY *ib = (dateKEY *) (((const Nsrt *) b)->t);
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int res;
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res = DatumGetInt32(DirectFunctionCall2(date_cmp, DateADTGetDatum(ia->lower), DateADTGetDatum(ib->lower)));
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if (res == 0)
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return DatumGetInt32(DirectFunctionCall2(date_cmp, DateADTGetDatum(ia->upper), DateADTGetDatum(ib->upper)));
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return res;
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}
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static float8
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gdb_date_dist(const void *a, const void *b)
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{
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/* we assume the difference can't overflow */
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Datum diff = DirectFunctionCall2(date_mi,
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DateADTGetDatum(*((const DateADT *) a)),
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DateADTGetDatum(*((const DateADT *) b)));
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return (float8) Abs(DatumGetInt32(diff));
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}
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static const gbtree_ninfo tinfo =
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{
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gbt_t_date,
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sizeof(DateADT),
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8, /* sizeof(gbtreekey8) */
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gbt_dategt,
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gbt_datege,
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gbt_dateeq,
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gbt_datele,
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gbt_datelt,
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gbt_datekey_cmp,
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gdb_date_dist
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};
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PG_FUNCTION_INFO_V1(date_dist);
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Datum
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date_dist(PG_FUNCTION_ARGS)
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{
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/* we assume the difference can't overflow */
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Datum diff = DirectFunctionCall2(date_mi,
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PG_GETARG_DATUM(0),
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PG_GETARG_DATUM(1));
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PG_RETURN_INT32(Abs(DatumGetInt32(diff)));
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}
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/**************************************************
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* date ops
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**************************************************/
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Datum
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gbt_date_compress(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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GISTENTRY *retval = NULL;
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PG_RETURN_POINTER(gbt_num_compress(retval, entry, &tinfo));
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}
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Datum
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gbt_date_consistent(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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DateADT query = PG_GETARG_DATEADT(1);
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StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
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/* Oid subtype = PG_GETARG_OID(3); */
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bool *recheck = (bool *) PG_GETARG_POINTER(4);
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dateKEY *kkk = (dateKEY *) DatumGetPointer(entry->key);
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GBT_NUMKEY_R key;
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/* All cases served by this function are exact */
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*recheck = false;
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key.lower = (GBT_NUMKEY *) &kkk->lower;
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key.upper = (GBT_NUMKEY *) &kkk->upper;
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PG_RETURN_BOOL(
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gbt_num_consistent(&key, (void *) &query, &strategy, GIST_LEAF(entry), &tinfo)
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);
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}
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Datum
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gbt_date_distance(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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DateADT query = PG_GETARG_DATEADT(1);
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/* Oid subtype = PG_GETARG_OID(3); */
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dateKEY *kkk = (dateKEY *) DatumGetPointer(entry->key);
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GBT_NUMKEY_R key;
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key.lower = (GBT_NUMKEY *) &kkk->lower;
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key.upper = (GBT_NUMKEY *) &kkk->upper;
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PG_RETURN_FLOAT8(
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gbt_num_distance(&key, (void *) &query, GIST_LEAF(entry), &tinfo)
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);
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}
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Datum
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gbt_date_union(PG_FUNCTION_ARGS)
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{
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GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
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void *out = palloc(sizeof(dateKEY));
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*(int *) PG_GETARG_POINTER(1) = sizeof(dateKEY);
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PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo));
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}
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Datum
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gbt_date_penalty(PG_FUNCTION_ARGS)
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{
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dateKEY *origentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
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dateKEY *newentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
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float *result = (float *) PG_GETARG_POINTER(2);
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int32 diff,
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res;
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diff = DatumGetInt32(DirectFunctionCall2(
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date_mi,
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DateADTGetDatum(newentry->upper),
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DateADTGetDatum(origentry->upper)));
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res = Max(diff, 0);
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diff = DatumGetInt32(DirectFunctionCall2(
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date_mi,
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DateADTGetDatum(origentry->lower),
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DateADTGetDatum(newentry->lower)));
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res += Max(diff, 0);
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*result = 0.0;
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if (res > 0)
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{
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diff = DatumGetInt32(DirectFunctionCall2(
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date_mi,
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DateADTGetDatum(origentry->upper),
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DateADTGetDatum(origentry->lower)));
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*result += FLT_MIN;
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*result += (float) (res / ((double) (res + diff)));
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*result *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1));
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}
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PG_RETURN_POINTER(result);
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}
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Datum
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gbt_date_picksplit(PG_FUNCTION_ARGS)
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{
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PG_RETURN_POINTER(gbt_num_picksplit(
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(GistEntryVector *) PG_GETARG_POINTER(0),
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(GIST_SPLITVEC *) PG_GETARG_POINTER(1),
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&tinfo
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));
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}
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Datum
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gbt_date_same(PG_FUNCTION_ARGS)
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{
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dateKEY *b1 = (dateKEY *) PG_GETARG_POINTER(0);
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dateKEY *b2 = (dateKEY *) PG_GETARG_POINTER(1);
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bool *result = (bool *) PG_GETARG_POINTER(2);
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*result = gbt_num_same((void *) b1, (void *) b2, &tinfo);
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PG_RETURN_POINTER(result);
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}
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