diff options
| -rw-r--r-- | system/helpers/captcha_helper.php | 45 | ||||
| -rw-r--r-- | user_guide_src/source/changelog.rst | 1 |
2 files changed, 24 insertions, 22 deletions
diff --git a/system/helpers/captcha_helper.php b/system/helpers/captcha_helper.php index fd1b8f1ed..3c1e006f8 100644 --- a/system/helpers/captcha_helper.php +++ b/system/helpers/captcha_helper.php @@ -171,35 +171,36 @@ if ( ! function_exists('create_captcha')) $byte_index = $word_index = 0; while ($word_index < $word_length) { - list(, $rand_index) = unpack('C', $bytes[$byte_index++]); - if ($rand_index > $rand_max) + // Do we have more random data to use? + // It could be exhausted by previous iterations + // ignoring bytes higher than $rand_max. + if ($byte_index === $pool_length) { - // Was this the last byte we have? - // If so, try to fetch more. - if ($byte_index === $pool_length) + // No failures should be possible if the + // first get_random_bytes() call didn't + // return FALSE, but still ... + for ($i = 0; $i < 5; $i++) { - // No failures should be possible if - // the first get_random_bytes() call - // didn't return FALSE, but still ... - for ($i = 0; $i < 5; $i++) + if (($bytes = $security->get_random_bytes($pool_length)) === FALSE) { - if (($bytes = $security->get_random_bytes($pool_length)) === FALSE) - { - continue; - } - - $byte_index = 0; - break; + continue; } - if ($bytes === FALSE) - { - // Sadly, this means fallback to mt_rand() - $word = ''; - break; - } + $byte_index = 0; + break; + } + + if ($bytes === FALSE) + { + // Sadly, this means fallback to mt_rand() + $word = ''; + break; } + } + list(, $rand_index) = unpack('C', $bytes[$byte_index++]); + if ($rand_index > $rand_max) + { continue; } diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst index a8cb3f5c3..cde4b8b4e 100644 --- a/user_guide_src/source/changelog.rst +++ b/user_guide_src/source/changelog.rst @@ -18,6 +18,7 @@ Bug fixes for 3.0.5 - Fixed a regression in :doc:`Form Helper <helpers/form_helper>` functions :php:func:`set_checkbox()`, :php:func:`set_radio()` where "checked" inputs aren't recognized after a form submit. - Fixed a bug (#4407) - :doc:`Text Helper <helpers/text_helper>` function :php:func:`word_censor()` doesn't work under PHP 7 if there's no custom replacement provided. - Fixed a bug (#4415) - :doc:`Form Validation Library <libraries/form_validation>` rule **valid_url** didn't accept URLs with IPv6 addresses enclosed in square brackets under PHP 5 (upstream bug). +- Fixed a bug (#4427) - :doc:`CAPTCHA Helper <helpers/capcha_helper>` triggers an error if the provided character pool is too small. Version 3.0.4 ============= |