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gdatetime: Fix a potential overflow in overflow calculations

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I can’t remember whether glong (tv.tv_sec) needs to be explicitly
promoted to gint64 here, or whether C does it automatically. Safer to
make the cast explicit to avoid overflow issues on 32-bit platforms,
where glong is 32-bit.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://bugzilla.gnome.org/show_bug.cgi?id=783841
This commit is contained in:
Philip Withnall 2017-06-16 12:31:58 +01:00
parent 18f8b77c04
commit 2db7aa4799
1 changed files with 1 additions and 1 deletions
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glib/gdatetime.c
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@ -128,7 +128,7 @@ struct _GDateTime
#define INSTANT_TO_UNIX(instant) \
((instant)/USEC_PER_SECOND - UNIX_EPOCH_START * SEC_PER_DAY)
#define UNIX_TO_INSTANT(unix) \
(((unix) + UNIX_EPOCH_START * SEC_PER_DAY) * USEC_PER_SECOND)
(((gint64) (unix) + UNIX_EPOCH_START * SEC_PER_DAY) * USEC_PER_SECOND)
#define UNIX_TO_INSTANT_IS_VALID(unix) \
((gint64) (unix) <= INSTANT_TO_UNIX (G_MAXINT64))