From d3e9b55223fc310b8c7c9b081618440582ea833e Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Mon, 4 Nov 2019 17:26:41 +0100
Subject: [PATCH] asn1: Distinguish error codes for invalid objects from
 implementation limitation (integer size)

---
 src/libopensc/asn1.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/libopensc/asn1.c b/src/libopensc/asn1.c
index 68a71022..61fe6fbe 100644
--- a/src/libopensc/asn1.c
+++ b/src/libopensc/asn1.c
@@ -718,8 +718,12 @@ int sc_asn1_decode_integer(const u8 * inbuf, size_t inlen, int *out)
 	int    a = 0, is_negative = 0;
 	size_t i = 0;
 
-	if (inlen > sizeof(int) || inlen == 0)
+	if (inlen == 0) {
 		return SC_ERROR_INVALID_ASN1_OBJECT;
+	}
+	if (inlen > sizeof(int)) {
+		return SC_ERROR_NOT_SUPPORTED;
+	}
 	if (inbuf[0] & 0x80) {
 		is_negative = 1;
 		a |= 0xff^(*inbuf++);