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gdatetime: Fix error handling in g_date_time_new_week()

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It was possible to pass in (for example) an invalid year to
g_date_time_new_week(), which would be passed on to g_date_time_new(),
which would (correctly) return `NULL` — but then
g_date_time_get_week_number() would try to dereference that.

Includes a test case.

oss-fuzz#17648

Signed-off-by: Philip Withnall <withnall@endlessm.com>
This commit is contained in:
Philip Withnall 2019-09-24 18:00:53 +01:00
parent a902addf6d
commit f4dd85628a
2 changed files with 3 additions and 0 deletions
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2
glib/gdatetime.c
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@ -1241,6 +1241,8 @@ g_date_time_new_week (GTimeZone *tz, gint year, gint week, gint week_day, gint h
return NULL;
dt = g_date_time_new (tz, year, 1, 4, 0, 0, 0);
if (dt == NULL)
return NULL;
g_date_time_get_week_number (dt, NULL, &jan4_week_day, NULL);
g_date_time_unref (dt);

1
glib/tests/gdatetime.c
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@ -868,6 +868,7 @@ test_GDateTime_new_from_iso8601_2 (void)
*/
{ FALSE, "1719W462 407777-07", 0, 0, 0, 0, 0, 0, 0, 0 },
{ FALSE, "4011090 260528Z", 0, 0, 0, 0, 0, 0, 0, 0 },
{ FALSE, "0000W011 228214-22", 0, 0, 0, 0, 0, 0, 0, 0 },
};
GTimeZone *tz = NULL;
GDateTime *dt = NULL;