mirror of
https://github.com/postgres/postgres.git
synced 2025-04-21 12:05:57 +03:00
a2fdeb7863
The dict_int text search dictionary template accepts maxlen parameter,
which is then used to cap the length of input strings. The value was
not properly checked, and the code simply does
txt[d->maxlen] = '\0';
to insert a terminator, leading to segfaults with negative values.
This commit simply rejects values less than 1. The issue was there since
dct_int was introduced in 9.3, so backpatch all the way back to 9.4
which is the oldest supported version.
Reported-by: cili
Discussion: https://postgr.es/m/16144-a36a5bef7657047d@postgresql.org
Backpatch-through: 9.4
101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* dict_int.c
|
|
* Text search dictionary for integers
|
|
*
|
|
* Copyright (c) 2007-2015, PostgreSQL Global Development Group
|
|
*
|
|
* IDENTIFICATION
|
|
* contrib/dict_int/dict_int.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include "commands/defrem.h"
|
|
#include "tsearch/ts_public.h"
|
|
|
|
PG_MODULE_MAGIC;
|
|
|
|
typedef struct
|
|
{
|
|
int maxlen;
|
|
bool rejectlong;
|
|
} DictInt;
|
|
|
|
|
|
PG_FUNCTION_INFO_V1(dintdict_init);
|
|
PG_FUNCTION_INFO_V1(dintdict_lexize);
|
|
|
|
Datum
|
|
dintdict_init(PG_FUNCTION_ARGS)
|
|
{
|
|
List *dictoptions = (List *) PG_GETARG_POINTER(0);
|
|
DictInt *d;
|
|
ListCell *l;
|
|
|
|
d = (DictInt *) palloc0(sizeof(DictInt));
|
|
d->maxlen = 6;
|
|
d->rejectlong = false;
|
|
|
|
foreach(l, dictoptions)
|
|
{
|
|
DefElem *defel = (DefElem *) lfirst(l);
|
|
|
|
if (pg_strcasecmp(defel->defname, "MAXLEN") == 0)
|
|
{
|
|
d->maxlen = atoi(defGetString(defel));
|
|
|
|
if (d->maxlen < 1)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("maxlen value has to be >= 1")));
|
|
}
|
|
else if (pg_strcasecmp(defel->defname, "REJECTLONG") == 0)
|
|
{
|
|
d->rejectlong = defGetBoolean(defel);
|
|
}
|
|
else
|
|
{
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("unrecognized intdict parameter: \"%s\"",
|
|
defel->defname)));
|
|
}
|
|
}
|
|
|
|
PG_RETURN_POINTER(d);
|
|
}
|
|
|
|
Datum
|
|
dintdict_lexize(PG_FUNCTION_ARGS)
|
|
{
|
|
DictInt *d = (DictInt *) PG_GETARG_POINTER(0);
|
|
char *in = (char *) PG_GETARG_POINTER(1);
|
|
char *txt = pnstrdup(in, PG_GETARG_INT32(2));
|
|
TSLexeme *res = palloc0(sizeof(TSLexeme) * 2);
|
|
|
|
res[1].lexeme = NULL;
|
|
if (PG_GETARG_INT32(2) > d->maxlen)
|
|
{
|
|
if (d->rejectlong)
|
|
{
|
|
/* reject by returning void array */
|
|
pfree(txt);
|
|
res[0].lexeme = NULL;
|
|
}
|
|
else
|
|
{
|
|
/* trim integer */
|
|
txt[d->maxlen] = '\0';
|
|
res[0].lexeme = txt;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
res[0].lexeme = txt;
|
|
}
|
|
|
|
PG_RETURN_POINTER(res);
|
|
}
|