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gregex: Prevent invalid memory access for unmatched subpatterns

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Based on a test by Emmanuel Pacaud.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Fixes: #2881
This commit is contained in:
Philip Withnall 2023-01-11 11:32:34 +00:00
parent 1955497993
commit fdd2d706b2
2 changed files with 36 additions and 2 deletions
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4
glib/gregex.c
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@ -1492,8 +1492,8 @@ get_matched_substring_number (const GMatchInfo *match_info,
for (entry = (guchar*) first; entry <= (guchar*) last; entry += entrysize)
{
gint n = (entry[0] << 8) + entry[1];
if (match_info->offsets[n*2] >= 0)
guint n = (entry[0] << 8) + entry[1];
if (n * 2 < match_info->n_offsets && match_info->offsets[n * 2] >= 0)
return n;
}

34
glib/tests/regex.c
View File

@ -2480,6 +2480,39 @@ test_jit_unsupported_matching_options (void)
g_regex_unref (regex);
}
static void
test_unmatched_named_subpattern (void)
{
GRegex *regex = NULL;
GMatchInfo *match_info = NULL;
const char *string = "Test";
g_test_summary ("Test that unmatched subpatterns can still be queried");
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/-/issues/2881");
regex = g_regex_new ("((?<Key>[^\\s\"'\\=]+)|\"(?<Key>[^\"]*)\"|'(?<Key>[^']*)')"
"(?:\\=((?<Value>[^\\s\"']+)|\"(?<Value>[^\"]*)\"|'(?<Value>[^']*)'))?",
G_REGEX_DUPNAMES, 0, NULL);
g_assert_true (g_regex_match (regex, string, 0, &match_info));
while (g_match_info_matches (match_info))
{
char *key = g_match_info_fetch_named (match_info, "Key");
char *value = g_match_info_fetch_named (match_info, "Value");
g_assert_cmpstr (key, ==, "Test");
g_assert_cmpstr (value, ==, "");
g_free (key);
g_free (value);
g_match_info_next (match_info, NULL);
}
g_match_info_unref (match_info);
g_regex_unref (regex);
}
int
main (int argc, char *argv[])
{
@ -2499,6 +2532,7 @@ main (int argc, char *argv[])
g_test_add_func ("/regex/max-lookbehind", test_max_lookbehind);
g_test_add_func ("/regex/compile-errors", test_compile_errors);
g_test_add_func ("/regex/jit-unsupported-matching", test_jit_unsupported_matching_options);
g_test_add_func ("/regex/unmatched-named-subpattern", test_unmatched_named_subpattern);
/* TEST_NEW(pattern, compile_opts, match_opts) */
TEST_NEW("[A-Z]+", G_REGEX_CASELESS | G_REGEX_EXTENDED | G_REGEX_OPTIMIZE, G_REGEX_MATCH_NOTBOL | G_REGEX_MATCH_PARTIAL);