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gdate: Limit length of dates which can be parsed as valid

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Realistically any date over 200 bytes long is not going to be valid, so
limit the input length so we can’t spend too long doing UTF-8 validation
or normalisation.

oss-fuzz#28718

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
This commit is contained in:
Philip Withnall 2020-12-18 11:38:31 +00:00
parent 4c6daefd6b
commit 3fc314ec38
2 changed files with 11 additions and 0 deletions
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7
glib/gdate.c
View File

@ -1229,12 +1229,19 @@ g_date_set_parse (GDate *d,
{
GDateParseTokens pt;
guint m = G_DATE_BAD_MONTH, day = G_DATE_BAD_DAY, y = G_DATE_BAD_YEAR;
gsize str_len;
g_return_if_fail (d != NULL);
/* set invalid */
g_date_clear (d, 1);
/* Anything longer than this is ridiculous and could take a while to normalize.
* This limit is chosen arbitrarily. */
str_len = strlen (str);
if (str_len > 200)
return;
/* The input has to be valid UTF-8. */
if (!g_utf8_validate (str, -1, NULL))
return;

4
glib/tests/date.c
View File

@ -191,6 +191,10 @@ test_parse_invalid (void)
{
/* Incomplete UTF-8 sequence */
"\xfd",
/* Ridiculously long input */
"12345678901234567890123456789012345678901234567890123456789012345678901234567890"
"12345678901234567890123456789012345678901234567890123456789012345678901234567890"
"12345678901234567890123456789012345678901234567890123456789012345678901234567890",
};
gsize i;