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guri: Fix UTF-8 validation when escaping URI components

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The return value from `g_utf8_get_char_validated()` is a `gunichar`,
which is unsigned, so comparing it with `> 0` is always going to return
true, even for return values `(gunichar) -1` and `(gunichar) -2`, which
indicate errors.

Handle them more explicitly.

oss-fuzz#26083

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
This commit is contained in:
Philip Withnall 2020-10-05 12:10:40 +01:00
parent 4d00344e1f
commit a4cba75581
2 changed files with 11 additions and 2 deletions
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9
glib/guri.c
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@ -420,8 +420,13 @@ _uri_encoder (GString *out,
while (p < end)
{
if (allow_utf8 && *p >= 0x80 &&
g_utf8_get_char_validated ((gchar *)p, end - p) > 0)
gunichar multibyte_utf8_char = 0;
if (allow_utf8 && *p >= 0x80)
multibyte_utf8_char = g_utf8_get_char_validated ((gchar *)p, end - p);
if (multibyte_utf8_char > 0 &&
multibyte_utf8_char != (gunichar) -1 && multibyte_utf8_char != (gunichar) -2)
{
gint len = g_utf8_skip [*p];
g_string_append_len (out, (gchar *)p, len);

4
glib/tests/uri.c
View File

@ -466,6 +466,10 @@ test_uri_escape_string (void)
{ ":+ \\?#", NULL, FALSE, "%3A%2B%20%5C%3F%23" },
{ "a+b:c", "+", FALSE, "a+b%3Ac" },
{ "a+b:c\303\234", "+", TRUE, "a+b%3Ac\303\234" },
/* Incomplete UTF-8 sequence: */
{ "\xfc\x3b\xd2", NULL, TRUE, "%FC%3B%D2" },
/* Invalid sequence: */
{ "\xc3\xb1\xc3\x28", NULL, TRUE, "ñ%C3%28" },
};
gsize i;