From 2591a491aa7cc736dc1751b7b1a4502eac5edf9e Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 3 Mar 2019 17:37:29 +0100
Subject: altsvc_out: check the return code from Curl_gmtime

Pointed out by Coverity, CID 1442956.

Closes #3640
---
 lib/altsvc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/altsvc.c b/lib/altsvc.c
index 97cdc7b8a..64ca2655d 100644
--- a/lib/altsvc.c
+++ b/lib/altsvc.c
@@ -216,7 +216,9 @@ static CURLcode altsvc_load(struct altsvcinfo *asi, const char *file)
 static CURLcode altsvc_out(struct altsvc *as, FILE *fp)
 {
   struct tm stamp;
-  Curl_gmtime(as->expires, &stamp);
+  CURLcode result = Curl_gmtime(as->expires, &stamp);
+  if(result)
+    return result;
 
   fprintf(fp,
           "%s %s %u "
-- 
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