Zend: is_callable() wrongly accepts objects with no get_closure handler. - #23123
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Zend: is_callable() wrongly accepts objects with no get_closure handler.#23123devnexen wants to merge 1 commit into
devnexen wants to merge 1 commit into
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Fix php#23121 zend_is_callable_at_frame() tested `get_closure && get_closure(...) == FAILURE`, so a NULL handler short circuited past the error branch into the success path, leaving fcc->function_handler NULL. zend_fcc_addref() then asserted and call_user_func() dereferenced the null zend_function.
Girgias
approved these changes
Aug 8, 2026
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Fix #23121
zend_is_callable_at_frame() tested
get_closure && get_closure(...) == FAILURE, so a NULL handler short circuited past the error branch into the success path, leaving fcc->function_handler NULL. zend_fcc_addref() then asserted and call_user_func() dereferenced the null zend_function.