[glib: 1/2] gtimer: Ensure arithmetic is correctly signed for ISO 8601 parsing

[Xavier Claessens <xclaesse src gnome org>]

commit 8c844291b78ee634a0ce2b826d7d8f2cff87c604
Author: Philip Withnall <withnall endlessm com>
Date:   Fri Aug 10 10:43:37 2018 +0100

    gtimer: Ensure arithmetic is correctly signed for ISO 8601 parsing
    
    When calculating the value of a timezone offset, ensure that any offsets
    done with negative numbers are done in a signed integer.
    
    oss-fuzz#9815
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 glib/gtimer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/glib/gtimer.c b/glib/gtimer.c
index 76da128c8..201225523 100644
--- a/glib/gtimer.c
+++ b/glib/gtimer.c
@@ -497,7 +497,7 @@ g_time_val_from_iso8601 (const gchar *iso_date,
       if (min > 59)
         return FALSE;
 
-      time_->tv_sec = mktime_utc (&tm) + (time_t) (60 * (60 * hour + min) * sign);
+      time_->tv_sec = mktime_utc (&tm) + (time_t) (60 * (gint64) (60 * hour + min) * sign);
     }
   else
     {