From 989f5ffb242faa185340268f2abb4892ffe1f6a5 Mon Sep 17 00:00:00 2001
From: toddouska <todd@wolfssl.com>
Date: Fri, 11 Sep 2015 15:49:55 -0700
Subject: [PATCH] handle gmtime failures

---
 wolfcrypt/src/asn.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/wolfcrypt/src/asn.c b/wolfcrypt/src/asn.c
index a889dc956..b7e7031c4 100644
--- a/wolfcrypt/src/asn.c
+++ b/wolfcrypt/src/asn.c
@@ -2585,6 +2585,11 @@ int ValidateDate(const byte* date, byte format, int dateType)
 
     localTime = XGMTIME(&ltime, tmpTime);
 
+    if (localTime == NULL) {
+        WOLFSSL_MSG("XGMTIME failed");
+        return 0;
+    }
+
     if (dateType == BEFORE) {
         if (DateLessThan(localTime, &certTime))
             return 0;
@@ -5634,7 +5639,8 @@ static void RebuildTime(time_t* in, struct tm* out)
 }
 
 
-/* Set Date validity from now until now + daysValid */
+/* Set Date validity from now until now + daysValid
+ * return size in bytes written to output, 0 on error */
 static int SetValidity(byte* output, int daysValid)
 {
     byte before[MAX_DATE_SIZE];
@@ -5661,6 +5667,11 @@ static int SetValidity(byte* output, int daysValid)
     ticks = XTIME(0);
     now   = XGMTIME(&ticks, tmpTime);
 
+    if (now == NULL) {
+        WOLFSSL_MSG("XGMTIME failed");
+        return 0;   /* error */
+    }
+
     /* before now */
     local = *now;
     before[0] = ASN_GENERALIZED_TIME;