From 9f412e995b898b6d75f343212f6a4b3ba399d9f5 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 7 Jul 2021 08:55:26 +0200
Subject: Clear errno before calling strto*() functions

---
 openssl/agent/pkcs11/url.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/openssl/agent/pkcs11/url.cxx b/openssl/agent/pkcs11/url.cxx
index 5bed7b0..0c946d9 100644
--- a/openssl/agent/pkcs11/url.cxx
+++ b/openssl/agent/pkcs11/url.cxx
@@ -27,6 +27,7 @@ namespace openssl
         {
           const char* b (s.c_str ());
           char* e (nullptr);
+          errno = 0; // We must clear it according to POSIX.
           uint64_t v (strtoull (b, &e, 10)); // Can't throw.
 
           if (errno != ERANGE && e == b + s.size () && v >= min && v <= max)
-- 
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