py/objstr: In find/rfind, don't crash when end < start.

This commit is contained in:
Jeff Epler 2018-03-31 21:27:56 -05:00 committed by Damien George
parent b9c78425a6
commit d6cf5c6749
3 changed files with 7 additions and 0 deletions

View File

@ -699,8 +699,13 @@ STATIC mp_obj_t str_finder(size_t n_args, const mp_obj_t *args, int direction, b
end = str_index_to_ptr(self_type, haystack, haystack_len, args[3], true);
}
if (end < start) {
goto out_error;
}
const byte *p = find_subbytes(start, end - start, needle, needle_len, direction);
if (p == NULL) {
out_error:
// not found
if (is_index) {
mp_raise_ValueError("substring not found");

View File

@ -21,6 +21,7 @@ print("0000".find('-1', 3))
print("0000".find('1', 3))
print("0000".find('1', 4))
print("0000".find('1', 5))
print("aaaaaaaaaaa".find("bbb", 9, 2))
try:
'abc'.find(1)

View File

@ -21,3 +21,4 @@ print("0000".rfind('-1', 3))
print("0000".rfind('1', 3))
print("0000".rfind('1', 4))
print("0000".rfind('1', 5))
print("aaaaaaaaaaa".rfind("bbb", 9, 2))