Fix month check in parse_http_time, add test

src/common/util.c

@@ -1451,6 +1451,8 @@ parse_http_time(const char *date, struct tm *tm)
 
   month[3] = '\0';
   /* Okay, now decode the month. */
+  /* set tm->tm_mon to dummy value so the check below fails. */
+  tm->tm_mon = -1;
   for (i = 0; i < 12; ++i) {
     if (!strcasecmp(MONTH_NAMES[i], month)) {
       tm->tm_mon = i;

src/test/test_util.c

@@ -121,6 +121,10 @@ test_util_parse_http_time(void *arg)
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
   test_eq(0, parse_http_time("Mie Aug 4 0:48:22 1994", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Sun, 1 Jan 2012 00:00:00 GMT", &a_time));
+  test_eq((time_t)1325376000UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Mon, 31 Dec 2012 00:00:00 GMT", &a_time));
+  test_eq((time_t)1356912000UL, tor_timegm(&a_time));
   test_eq(-1, parse_http_time("2004-08-zz 99-99x99 GMT", &a_time));
   test_eq(-1, parse_http_time("2011-03-32 00:00:00 GMT", &a_time));
   test_eq(-1, parse_http_time("2011-03-30 24:00:00 GMT", &a_time));