[glib: 1/2] gdatetime: Widen a variable before multiplication

[Philip Withnall <pwithnall src gnome org>]

commit b0be67cc3fce2fa7019cfb769a6ae22ba3bd6d56
Author: Philip Withnall <withnall endlessm com>
Date:   Tue Aug 18 10:22:00 2020 +0100

    gdatetime: Widen a variable before multiplication
    
    Otherwise it could possibly overflow on 32-bit machines if `year` is
    high enough, although I don’t think that’s possible because of limits
    applied on it by callers. This should shut Coverity up though.
    
    The limits applied by callers could be circumvented by calling (say)
    `g_date_time_add_years()` multiple times. That’s a bug, but not one I’m
    going to fix today.
    
    Coverity CID: #1159479
    Signed-off-by: Philip Withnall <withnall endlessm com>

 glib/gdatetime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index f85afab0c..fab60c441 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -598,7 +598,7 @@ ymd_to_days (gint year,
 {
   gint64 days;
 
-  days = (year - 1) * 365 + ((year - 1) / 4) - ((year - 1) / 100)
+  days = ((gint64) year - 1) * 365 + ((year - 1) / 4) - ((year - 1) / 100)
       + ((year - 1) / 400);
 
   days += days_in_year[0][month - 1];