File opensc-oberthur-return-values.patch of Package opensc

From 1db88374bb7706a115d5c3617c6f16115c33bf27 Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Thu, 7 Jan 2021 14:20:31 +0100
Subject: [PATCH] oberthur: Correctly check for return values

Thanks oss-fuzz

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28843
---
 src/libopensc/pkcs15-oberthur.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Index: opensc-0.13.0/src/libopensc/pkcs15-oberthur.c
===================================================================
--- opensc-0.13.0.orig/src/libopensc/pkcs15-oberthur.c
+++ opensc-0.13.0/src/libopensc/pkcs15-oberthur.c
@@ -298,15 +298,20 @@ sc_oberthur_read_file(struct sc_pkcs15_c
 	if (verify_pin && rv == SC_ERROR_SECURITY_STATUS_NOT_SATISFIED)   {
 		struct sc_pkcs15_object *objs[0x10], *pin_obj = NULL;
 		const struct sc_acl_entry *acl = sc_file_get_acl_entry(file, SC_AC_OP_READ);
-		int ii;
+		int ii, nobjs;
 
-		rv = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_AUTH_PIN, objs, 0x10);
-		SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, rv, "Cannot read oberthur file: get AUTH objects error");
+		nobjs = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_AUTH_PIN, objs, 0x10);
+		if (nobjs < 1) {
+			sc_file_free(file);
+			free(*out);
+			*out = NULL;
+			LOG_TEST_RET(ctx, rv, "Cannot read oberthur file: get AUTH objects error");
+		}
 
-		for (ii=0; ii<rv; ii++)   {
+		for (ii = 0; ii < nobjs; ii++) {
 			struct sc_pkcs15_auth_info *auth_info = (struct sc_pkcs15_auth_info *) objs[ii]->data;
 			sc_debug(ctx, SC_LOG_DEBUG_NORMAL, "compare PIN/ACL refs:%i/%i, method:%i/%i", 
-					auth_info->attrs.pin.reference, acl->key_ref, auth_info->auth_method, acl->method);
+				auth_info->attrs.pin.reference, acl->key_ref, auth_info->auth_method, acl->method);
 			if (auth_info->attrs.pin.reference == (int)acl->key_ref && auth_info->auth_method == (unsigned)acl->method)   {
 				pin_obj = objs[ii];
 				break;