ext/session: Fix NULL pointer dereference in SessionHandler::create_sid()#22580
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jorgsowa wants to merge 1 commit into
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ext/session: Fix NULL pointer dereference in SessionHandler::create_sid()#22580jorgsowa wants to merge 1 commit into
jorgsowa wants to merge 1 commit into
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s_create_sid() can return NULL when php_random_bytes_throw() fails (e.g. CSPRNG exhaustion), but RETURN_STR() dereferences the string unconditionally. Every other internal caller of s_create_sid() in session.c (php_session_initialize, session_regenerate_id) already NULL-checks the result; this PHP-facing method, reachable from any userland SessionHandler subclass via create_sid(), did not. No dedicated regression test is added: forcing php_random_bytes_throw() to fail is not portably reproducible from a .phpt test (it's a raw getrandom() syscall on Linux and CCRandomGenerateBytes on macOS, neither of which can be faulted from userland), which is also why the existing NULL-checks this mirrors in session.c have none either.
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s_create_sid()can return NULL whenphp_random_bytes_throw()fails (e.g. CSPRNG exhaustion). Every other internal caller ofs_create_sid()in session.c (php_session_initialize, session_regenerate_id) already NULL-checks the result.It's not possible to test it through .phpt test file. Should it be pointed to the PHP8.4 branch?