From patchwork Mon Apr 20 08:32:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 284203 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17ACCC3815B for ; Mon, 20 Apr 2020 08:39:09 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D59AD2078E for ; Mon, 20 Apr 2020 08:39:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="cW7hUOFz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D59AD2078E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:59700 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQRxM-0005cR-32 for qemu-devel@archiver.kernel.org; Mon, 20 Apr 2020 04:39:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56484 helo=eggs1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQRrC-0002tj-EO for qemu-devel@nongnu.org; Mon, 20 Apr 2020 04:32:46 -0400 Received: from Debian-exim by eggs1p.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jQRrA-0006wX-Kl for qemu-devel@nongnu.org; Mon, 20 Apr 2020 04:32:46 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:54063 helo=us-smtp-delivery-1.mimecast.com) by eggs1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jQRrA-0006ue-7R for qemu-devel@nongnu.org; Mon, 20 Apr 2020 04:32:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1587371563; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8IwJuUhdu7xVAnYSveDtWGbyVZ74+1IB1yT93ItMesU=; b=cW7hUOFznlHN6rY7Znw/lNlR+Z2iSCpsYBrE4o90YNa+6JaWIJngfqzABycHfduJI7ea6c gW3pqXDlf4Ie2fBGT31T8iZQybC/3H9Li0PcYmukIoRnM0+eGRhVzlEI/COz8q4sMbcagg 8FyRAqxCbuIJavVHET9l4blNaXhmv2o= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-297-DwqgQ15fM1WjDn9fWgMn0Q-1; Mon, 20 Apr 2020 04:32:41 -0400 X-MC-Unique: DwqgQ15fM1WjDn9fWgMn0Q-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 02FA0DB21 for ; Mon, 20 Apr 2020 08:32:41 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-113-6.ams2.redhat.com [10.36.113.6]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 424995D9CD; Mon, 20 Apr 2020 08:32:38 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id A29ED11358BE; Mon, 20 Apr 2020 10:32:36 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH 02/11] block/file-posix: Fix check_cache_dropped() error handling Date: Mon, 20 Apr 2020 10:32:27 +0200 Message-Id: <20200420083236.19309-3-armbru@redhat.com> In-Reply-To: <20200420083236.19309-1-armbru@redhat.com> References: <20200420083236.19309-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.81; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs1p.gnu.org: First seen = 2020/04/20 01:47:04 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Hajnoczi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. check_cache_dropped() calls error_setg() in a loop. It fails to break the loop in one instance. If a subsequent iteration error_setg()s again, it trips error_setv()'s assertion. Fix it to break the loop. Fixes: 31be8a2a97ecba7d31a82932286489cac318e9e9 Cc: Stefan Hajnoczi Signed-off-by: Markus Armbruster --- block/file-posix.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/block/file-posix.c b/block/file-posix.c index 7e19bbff5f..094e3b0212 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -2691,10 +2691,13 @@ static void check_cache_dropped(BlockDriverState *bs, Error **errp) vec_end = DIV_ROUND_UP(length, page_size); for (i = 0; i < vec_end; i++) { if (vec[i] & 0x1) { - error_setg(errp, "page cache still in use!"); break; } } + if (i < vec_end) { + error_setg(errp, "page cache still in use!"); + break; + } } if (window) {