Consistent error handling in mysqli_poll

This error condition should not actually be reachable, but change
it to be consistent with the other ones.

Also fix a memory leak.

Closes GH-6340.

Author: kamil-tekiela

ext/mysqli/mysqli_nonapi.c

@@ -740,7 +740,7 @@ static int mysqlnd_zval_array_to_mysqlnd_array(zval *in_array, MYSQLND ***out_ar
 			MYSQLI_RESOURCE *my_res;
 			mysqli_object *intern = Z_MYSQLI_P(elem);
 			if (!(my_res = (MYSQLI_RESOURCE *)intern->ptr)) {
-		  		zend_throw_error(NULL, "%s object is already closed", ZSTR_VAL(intern->zo.ce->name));
+				zend_throw_error(NULL, "%s object is already closed", ZSTR_VAL(intern->zo.ce->name));
 				return FAILURE;
 		  	}
 			mysql = (MY_MYSQL*) my_res->ptr;
@@ -761,12 +761,11 @@ static int mysqlnd_zval_array_from_mysqlnd_array(MYSQLND **in_array, zval *out_a
 	MYSQLND **p = in_array;
 	zval dest_array;
 	zval *elem, *dest_elem;
-	int ret = 0, i = 0;
+	int ret = 0;
 
 	array_init_size(&dest_array, zend_hash_num_elements(Z_ARRVAL_P(out_array)));
 
 	ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(out_array), elem) {
-		i++;
 		if (Z_TYPE_P(elem) != IS_OBJECT ||
 				!instanceof_function(Z_OBJCE_P(elem), mysqli_link_class_entry)) {
 			continue;
@@ -776,8 +775,8 @@ static int mysqlnd_zval_array_from_mysqlnd_array(MYSQLND **in_array, zval *out_a
 			MYSQLI_RESOURCE *my_res;
 			mysqli_object *intern = Z_MYSQLI_P(elem);
 			if (!(my_res = (MYSQLI_RESOURCE *)intern->ptr)) {
-		  		php_error_docref(NULL, E_WARNING, "[%d] Couldn't fetch %s", i, ZSTR_VAL(intern->zo.ce->name));
-				continue;
+				zend_throw_error(NULL, "%s object is already closed", ZSTR_VAL(intern->zo.ce->name));
+				return FAILURE;
 		  	}
 			mysql = (MY_MYSQL *) my_res->ptr;
 			if (mysql->mysql == *p) {
@@ -867,6 +866,7 @@ PHP_FUNCTION(mysqli_poll)
 	if (e_array != NULL) {
 		if (mysqlnd_zval_array_to_mysqlnd_array(e_array, &new_e_array) == FAILURE) {
 			efree(new_e_array);
+			efree(new_r_array);
 			RETURN_THROWS();
 		}
 	}

ext/mysqli/mysqli_warning.c

@@ -201,7 +201,7 @@ static int mysqli_warning_message(mysqli_object *obj, zval *retval, zend_bool qu
 
 	if (!obj->ptr || !((MYSQLI_RESOURCE *)(obj->ptr))->ptr) {
 		if (!quiet) {
-			zend_throw_error(NULL, "Couldn't fetch %s", ZSTR_VAL(obj->zo.ce->name));
+			zend_throw_error(NULL, "%s object is already closed", ZSTR_VAL(obj->zo.ce->name));
 		}
 
 		return FAILURE;
@@ -221,7 +221,7 @@ static int mysqli_warning_sqlstate(mysqli_object *obj, zval *retval, zend_bool q
 
 	if (!obj->ptr || !((MYSQLI_RESOURCE *)(obj->ptr))->ptr) {
 		if (!quiet) {
-			zend_throw_error(NULL, "Couldn't fetch %s", ZSTR_VAL(obj->zo.ce->name));
+			zend_throw_error(NULL, "%s object is already closed", ZSTR_VAL(obj->zo.ce->name));
 		}
 
 		return FAILURE;
@@ -241,7 +241,7 @@ static int mysqli_warning_errno(mysqli_object *obj, zval *retval, zend_bool quie
 
 	if (!obj->ptr || !((MYSQLI_RESOURCE *)(obj->ptr))->ptr) {
 		if (!quiet) {
-			zend_throw_error(NULL, "Couldn't fetch %s", ZSTR_VAL(obj->zo.ce->name));
+			zend_throw_error(NULL, "%s object is already closed", ZSTR_VAL(obj->zo.ce->name));
 		}
 
 		return FAILURE;

ext/mysqli/tests/mysqli_poll.phpt

@@ -40,6 +40,14 @@ if (!$IS_MYSQLND)
         echo $e->getMessage() . \PHP_EOL;
     }
 
+    $link->close();
+    $read[0] = get_connection();
+    try {
+        mysqli_poll($read, $error, $reject, 0, 1);
+    } catch (\Error $e) {
+        echo $e->getMessage() . \PHP_EOL;
+    }
+
     function poll_async($offset, $link, $links, $errors, $reject, $exp_ready, $use_oo_syntax) {
 
         if ($exp_ready !== ($tmp = mysqli_poll($links, $errors, $reject, 0, 1000)))
@@ -116,6 +124,7 @@ if (!$IS_MYSQLND)
 --EXPECTF--
 mysqli_poll(): Argument #4 ($seconds) must be greater than or equal to 0
 mysqli_poll(): Argument #5 ($microseconds) must be greater than or equal to 0
+mysqli object is already closed
 [012 + 6] Rejecting thread %d: 0/
 [013 + 6] Rejecting thread %d: 0/
 [014 + 6] Rejecting thread %d: 0/