Reset EG(filename_override) after fatal error

Fixes oss-fuzz #45492

Author: dstogov

Zend/tests/gh7771_3.phpt

@@ -0,0 +1,16 @@
+--TEST--
+GH-7771.3 (Incorrect file/line for class constant expression exceptions)
+--FILE--
+<?php
+$classlist = [
+    'space1\C' => 'class y{const y="$y";}',
+    'D' => 'class D{const HW=space1\C::y;}'
+];
+spl_autoload_register(function($class) use ($classlist) {
+    eval($classlist[$class]);
+});
+var_dump(D::HW);
+?>
+--EXPECTF--
+Fatal error: Constant expression contains invalid operations in %sgh7771_3.php(7) : eval()'d code(1) : eval()'d code on line 1
+

Zend/zend_ast.c

@@ -789,6 +789,8 @@ ZEND_API zend_result ZEND_FASTCALL zend_ast_evaluate(zval *result, zend_ast *ast
 		{
 			zend_string *class_name = zend_ast_get_str(ast->child[0]);
 			zend_string *const_name = zend_ast_get_str(ast->child[1]);
+			zval *zv;
+			bool bailout = 0;
 
 			zend_string *previous_filename;
 			zend_long previous_lineno;
@@ -798,11 +800,18 @@ ZEND_API zend_result ZEND_FASTCALL zend_ast_evaluate(zval *result, zend_ast *ast
 				EG(filename_override) = scope->info.user.filename;
 				EG(lineno_override) = zend_ast_get_lineno(ast);
 			}
-			zval *zv = zend_get_class_constant_ex(class_name, const_name, scope, ast->attr);
+			zend_try {
+				zv = zend_get_class_constant_ex(class_name, const_name, scope, ast->attr);
+			} zend_catch {
+				bailout = 1;
+			}  zend_end_try();
 			if (scope) {
 				EG(filename_override) = previous_filename;
 				EG(lineno_override) = previous_lineno;
 			}
+			if (bailout) {
+				zend_bailout();
+			}
 
 			if (UNEXPECTED(zv == NULL)) {
 				ZVAL_UNDEF(result);