Fixed Bug #66412 readline_clear_history() with libedit causes segfault after #65714

Checking all libedit functions, this check is done in each functions (add_history,
read_history, write_history, ...) but is missing in clear_history.

Test coverage: readline_clear_history_001.phpt

Author: remicollet

NEWS

@@ -17,6 +17,10 @@ PHP                                                                        NEWS
   . Fixed bug #66298 (ext/opcache/Optimizer/zend_optimizer.c has dos-style 
     ^M as lineend). (Laruence)
 
+- Readline
+  . Fixed Bug #66412 (readline_clear_history() with libedit causes segfault after
+    #65714). (Remi)
+
 - Session
   . Fixed bug #66469 (Session module is sending multiple set-cookie headers when
     session.use_strict_mode=1) (Yasuo)

ext/readline/readline.c

@@ -354,6 +354,11 @@ PHP_FUNCTION(readline_clear_history)
 		return;
 	}
 
+#if HAVE_LIBEDIT
+	/* clear_history is the only function where rl_initialize
+	   is not call to ensure correct allocation */
+	using_history();
+#endif
 	clear_history();
 
 	RETURN_TRUE;