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Clear errno before calling strtol() in spell.c.

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Per POSIX, a caller of strtol() that wishes to check for errors must
set errno to 0 beforehand.  Several places in spell.c neglected that,
so that they risked delivering a false overflow error in case errno
had been ERANGE already.  Given the lack of field reports, this case
may be unreachable at present --- but it's surely trouble waiting to
happen, so fix it.

Author: Jacob Brazeal <jacob.brazeal@gmail.com>
Discussion: https://postgr.es/m/CA+COZaBhsq6EromFm+knMJfzK6nTpG23zJ+K2=nfUQQXcj_xcQ@mail.gmail.com
Backpatch-through: 13
This commit is contained in:
Tom Lane 2025-03-08 11:24:22 -05:00
parent c3510cfc8b
commit 99c01aadf9
1 changed files with 4 additions and 0 deletions
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4
src/backend/tsearch/spell.c
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@ -374,6 +374,7 @@ getNextFlagFromString(IspellDict *Conf, char **sflagset, char *sflag)
stop = (maxstep == 0);
break;
case FM_NUM:
errno = 0;
s = strtol(*sflagset, &next, 10);
if (*sflagset == next || errno == ERANGE)
ereport(ERROR,
@ -1036,6 +1037,7 @@ setCompoundAffixFlagValue(IspellDict *Conf, CompoundAffixFlag *entry,
char *next;
int i;
errno = 0;
i = strtol(s, &next, 10);
if (s == next || errno == ERANGE)
ereport(ERROR,
@ -1163,6 +1165,7 @@ getAffixFlagSet(IspellDict *Conf, char *s)
int curaffix;
char *end;
errno = 0;
curaffix = strtol(s, &end, 10);
if (s == end || errno == ERANGE)
ereport(ERROR,
@ -1735,6 +1738,7 @@ NISortDictionary(IspellDict *Conf)
if (*Conf->Spell[i]->p.flag != '\0')
{
errno = 0;
curaffix = strtol(Conf->Spell[i]->p.flag, &end, 10);
if (Conf->Spell[i]->p.flag == end || errno == ERANGE)
ereport(ERROR,