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Merge branch 'wip/pwithnall/freebsd-math' into 'master'

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gdatetime: Improve ISO 8601 parsing to avoid floating point checks

See merge request GNOME/glib!1797
This commit is contained in:
Sebastian Dröge 2020-12-12 18:15:48 +00:00
commit a4be8577ed
2 changed files with 46 additions and 8 deletions
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14
glib/gdatetime.c
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@ -1181,7 +1181,7 @@ static gboolean
get_iso8601_seconds (const gchar *text, gsize length, gdouble *value)
{
gsize i;
gdouble divisor = 1, v = 0;
guint64 divisor = 1, v = 0;
if (length < 2)
return FALSE;
@ -1208,17 +1208,15 @@ get_iso8601_seconds (const gchar *text, gsize length, gdouble *value)
for (; i < length; i++)
{
const gchar c = text[i];
if (c < '0' || c > '9')
if (c < '0' || c > '9' ||
v > (G_MAXUINT64 - (c - '0')) / 10 ||
divisor > G_MAXUINT64 / 10)
return FALSE;
v = v * 10 + (c - '0');
divisor *= 10;
}
v = v / divisor;
if (!isfinite (v))
return FALSE;
*value = v;
*value = (gdouble) v / divisor;
return TRUE;
}
@ -1590,7 +1588,7 @@ g_date_time_new (GTimeZone *tz,
day < 1 || day > days_in_months[GREGORIAN_LEAP (year)][month] ||
hour < 0 || hour > 23 ||
minute < 0 || minute > 59 ||
!isfinite (seconds) ||
isnan (seconds) ||
seconds < 0.0 || seconds >= 60.0)
return NULL;

40
glib/tests/gdatetime.c
View File

@ -743,6 +743,14 @@ test_GDateTime_new_from_iso8601 (void)
dt = g_date_time_new_from_iso8601 ("--0824T22:10:42Z", NULL);
g_assert_null (dt);
/* Seconds must be two digits. */
dt = g_date_time_new_from_iso8601 ("2016-08-10T22:10:4Z", NULL);
g_assert_null (dt);
/* Seconds must all be digits. */
dt = g_date_time_new_from_iso8601 ("2016-08-10T22:10:4aZ", NULL);
g_assert_null (dt);
/* Check subseconds work */
dt = g_date_time_new_from_iso8601 ("2016-08-24T22:10:42.123456Z", NULL);
ASSERT_DATE (dt, 2016, 8, 24);
@ -759,6 +767,28 @@ test_GDateTime_new_from_iso8601 (void)
ASSERT_TIME (dt, 22, 10, 42, 123456);
g_date_time_unref (dt);
/* Subseconds must all be digits. */
dt = g_date_time_new_from_iso8601 ("2016-08-10T22:10:42.5aZ", NULL);
g_assert_null (dt);
/* Subseconds can be an arbitrary length, but must not overflow.
* The ASSERT_TIME() comparisons are constrained by only comparing up to
* microsecond granularity. */
dt = g_date_time_new_from_iso8601 ("2016-08-10T22:10:09.222222222222222222Z", NULL);
ASSERT_DATE (dt, 2016, 8, 10);
ASSERT_TIME (dt, 22, 10, 9, 222222);
g_date_time_unref (dt);
dt = g_date_time_new_from_iso8601 ("2016-08-10T22:10:09.2222222222222222222Z", NULL);
g_assert_null (dt);
/* Small numerator, large divisor when parsing the subseconds. */
dt = g_date_time_new_from_iso8601 ("2016-08-10T22:10:00.0000000000000000001Z", NULL);
ASSERT_DATE (dt, 2016, 8, 10);
ASSERT_TIME (dt, 22, 10, 0, 0);
g_date_time_unref (dt);
dt = g_date_time_new_from_iso8601 ("2016-08-10T22:10:00.00000000000000000001Z", NULL);
g_assert_null (dt);
/* We don't support times without minutes / seconds (valid ISO 8601) */
dt = g_date_time_new_from_iso8601 ("2016-08-24T22Z", NULL);
g_assert_null (dt);
@ -1280,8 +1310,18 @@ test_GDateTime_new_full (void)
g_date_time_unref (dt);
dt = g_date_time_new_utc (2016, 12, 32, 22, 10, 42);
g_assert_null (dt);
/* Seconds limits. */
dt = g_date_time_new_utc (2020, 12, 9, 14, 49, NAN);
g_assert_null (dt);
dt = g_date_time_new_utc (2020, 12, 9, 14, 49, -0.1);
g_assert_null (dt);
dt = g_date_time_new_utc (2020, 12, 9, 14, 49, 60.0);
g_assert_null (dt);
/* Year limits */
dt = g_date_time_new_utc (10000, 1, 1, 0, 0, 0);
dt = g_date_time_new_utc (0, 1, 1, 0, 0, 0);
}
static void