From b4f59ba80f0f425e0b5493ed7b86c451d9d2f45d Mon Sep 17 00:00:00 2001
From: Janusz Majnert <janusz.majnert@tietoevry.com>
Date: Tue, 31 Oct 2023 15:04:46 +0100
Subject: [PATCH] APER - Check that calculated rawLength is not zero

---
 pkg/asn1/aper/aper.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/asn1/aper/aper.go b/pkg/asn1/aper/aper.go
index d4cf10d..0fee726 100644
--- a/pkg/asn1/aper/aper.go
+++ b/pkg/asn1/aper/aper.go
@@ -578,6 +578,10 @@ func (pd *perBitData) parseInteger(extensed bool, lowerBoundPtr *int64, upperBou
 		rawLength = uint(pd.bytes[pd.byteOffset])
 		pd.byteOffset++
 		log.Debugf("%s", perBitLog(8, pd.byteOffset, pd.bitsOffset, uint64(rawLength)))
+		if rawLength == 0 {
+			err := fmt.Errorf("rawLength cannot be 0")
+			return int64(0), err
+		}
 	} else if valueRange <= 65536 {
 		rawValue, err := pd.parseConstraintValue(valueRange)
 		if err != nil {