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reset global pointers to prevent use-after-free in zend_jit_status() #19212

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reset global pointers to prevent use-after-free in zend_jit_status() #19212

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a4f1c89
reset global pointers to prevent use-after-free
realFlowControl Jul 22, 2025
c939b91
clarify comment
realFlowControl Jul 22, 2025
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@realFlowControl
realFlowControl committed Jul 24, 2025
commit c939b91bf9e9f1c46ffde812d1c4196af4b9b1ab
6 changes: 4 additions & 2 deletions ext/opcache/jit/zend_jit.c
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Expand Up @@ -791,7 +791,7 @@ ZEND_EXT_API void zend_jit_status(zval *ret)
add_assoc_long(&stats, "kind", JIT_G(trigger));
add_assoc_long(&stats, "opt_level", JIT_G(opt_level));
add_assoc_long(&stats, "opt_flags", JIT_G(opt_flags));
if (dasm_buf && dasm_end && dasm_ptr) {
if (dasm_buf) {
add_assoc_long(&stats, "buffer_size", (char*)dasm_end - (char*)dasm_buf);
add_assoc_long(&stats, "buffer_free", (char*)dasm_end - (char*)*dasm_ptr);
} else {
Expand Down Expand Up @@ -5088,7 +5088,9 @@ ZEND_EXT_API void zend_jit_shutdown(void)
zend_jit_trace_free_caches(&jit_globals);
#endif

// Reset global pointers to prevent use-after-free in Apache reload
/* Reset global pointers to prevent use-after-free in `zend_jit_status()`
* after gracefully restarting Apache with mod_php, see:
* https://github.com/php/php-src/pull/19212 */
dasm_ptr = NULL;
dasm_buf = NULL;
dasm_end = NULL;
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