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

tglsfdc · tglsfdc · commit f1c1bafcdf76 · 2025-03-08T11:25:01.000-05:00
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
diff --git a/src/backend/tsearch/spell.c b/src/backend/tsearch/spell.c
@@ -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,
@@ -1056,6 +1057,7 @@ setCompoundAffixFlagValue(IspellDict *Conf, CompoundAffixFlag *entry,
 		char	   *next;
 		int			i;
 
+		errno = 0;
 		i = strtol(s, &next, 10);
 		if (s == next || errno == ERANGE)
 			ereport(ERROR,
@@ -1183,6 +1185,7 @@ getAffixFlagSet(IspellDict *Conf, char *s)
 		int			curaffix;
 		char	   *end;
 
+		errno = 0;
 		curaffix = strtol(s, &end, 10);
 		if (s == end || errno == ERANGE)
 			ereport(ERROR,
@@ -1754,6 +1757,7 @@ 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,
