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password_get_info() and password_needs_rehash() identified any 60-byte "$2y" hash as bcrypt and read its cost with sscanf(), so they reported costs that crypt() rejects, such as 03 or 32, and overflowed zend_long on a run of 56 digits. Require exactly two digits in the 04-31 range followed by '$'. password_verify() is unaffected, as unidentified hashes still go through crypt().
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Submitted upstream as php#24203. |
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Reject malformed and out-of-range bcrypt cost fields before password verification uses them. The regression tests cover invalid costs and supported valid values.