From e032117db251968bd09badc7d4718c2497302e55 Mon Sep 17 00:00:00 2001
From: "Dr. Stephen Henson" <steve@openssl.org>
Date: Fri, 29 Jul 2016 17:54:52 +0100
Subject: [PATCH] Fix CRL time comparison.

Thanks to David Benjamin <davidben@google.com> for reporting this bug.

Reviewed-by: Rich Salz <rsalz@openssl.org>
---
 crypto/x509/x509_vfy.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
index abe9caae13..099a4d81bb 100644
--- a/crypto/x509/x509_vfy.c
+++ b/crypto/x509/x509_vfy.c
@@ -979,7 +979,11 @@ static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
             if (ASN1_TIME_diff(&day, &sec, X509_CRL_get_lastUpdate(best_crl),
                                X509_CRL_get_lastUpdate(crl)) == 0)
                 continue;
-            if (day < 0 || sec <= 0)
+            /*
+             * ASN1_TIME_diff never returns inconsistent signs for |day|
+             * and |sec|.
+             */
+            if (day <= 0 && sec <= 0)
                 continue;
         }
         best_crl = crl;
-- 
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