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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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reset global pointers to prevent use-after-free
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@realFlowControl
realFlowControl committed Jul 24, 2025
commit a4f1c898dfeb5ae72d9b1aa25640bae715249e82
8 changes: 7 additions & 1 deletion ext/opcache/jit/zend_jit.c
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Original file line number Diff line number Diff line change
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) {
if (dasm_buf && dasm_end && dasm_ptr) {
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 @@ -5087,6 +5087,12 @@ ZEND_EXT_API void zend_jit_shutdown(void)
#else
zend_jit_trace_free_caches(&jit_globals);
#endif

// Reset global pointers to prevent use-after-free in Apache reload
dasm_ptr = NULL;
dasm_buf = NULL;
dasm_end = NULL;
dasm_size = 0;
}

static void zend_jit_reset_counters(void)
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