cookies: expire "Max-Age=0" immediately

Reported-by: Jeroen Ooms
Fixes #3351
Closes #3352

diff --git a/lib/cookie.c b/lib/cookie.c
index d8655f7908fac583182d6c27f7f67800a4048d87..3dc85ee5caee1f361df1e21810a986563906f114 100644 (file)
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -675,7 +675,10 @@ Curl_cookie_add(struct Curl_easy *data,
         /* overflow, used max value */
         co->expires = CURL_OFF_T_MAX;
       else if(!offt) {
-        if(CURL_OFF_T_MAX - now < co->expires)
+        if(!co->expires)
+          /* already expired */
+          co->expires = 1;
+        else if(CURL_OFF_T_MAX - now < co->expires)
           /* would overflow */
           co->expires = CURL_OFF_T_MAX;
         else