Reset global pointers to prevent use-after-free

Closes GH-19212.

Author: realFlowControl

NEWS

@@ -2,7 +2,9 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 8.1.34
 
-
+- Opcache:
+  . Reset global pointers to prevent use-after-free in zend_jit_status().
+    (Florian Engelhardt)
 
 03 Jul 2025, PHP 8.1.33
 

ext/opcache/jit/zend_jit.c

@@ -5087,6 +5087,14 @@ 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 `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;
+	dasm_size = 0;
 }
 
 static void zend_jit_reset_counters(void)