From patchwork Tue Mar 15 18:34:31 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 8591571 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 71A239F44D for ; Tue, 15 Mar 2016 18:41:30 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D389720272 for ; Tue, 15 Mar 2016 18:41:29 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2DEC62026C for ; Tue, 15 Mar 2016 18:41:29 +0000 (UTC) Received: from localhost ([::1]:50650 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aftuK-0002Tg-IC for patchwork-qemu-devel@patchwork.kernel.org; Tue, 15 Mar 2016 14:41:28 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43708) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afto9-0006eH-3A for qemu-devel@nongnu.org; Tue, 15 Mar 2016 14:35:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1afto7-0001q4-Qi for qemu-devel@nongnu.org; Tue, 15 Mar 2016 14:35:04 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48466) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afto7-0001pZ-LJ for qemu-devel@nongnu.org; Tue, 15 Mar 2016 14:35:03 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 3E44C7AEB1; Tue, 15 Mar 2016 18:35:03 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-46.ams2.redhat.com [10.36.116.46]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2FIZ1bg016498 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 15 Mar 2016 14:35:02 -0400 Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id B9ADC3004FB8; Tue, 15 Mar 2016 19:34:56 +0100 (CET) From: Markus Armbruster To: qemu-devel@nongnu.org Date: Tue, 15 Mar 2016 19:34:31 +0100 Message-Id: <1458066895-20632-17-git-send-email-armbru@redhat.com> In-Reply-To: <1458066895-20632-1-git-send-email-armbru@redhat.com> References: <1458066895-20632-1-git-send-email-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: claudio.fontana@huawei.com, cam@cs.ualberta.ca, mlureau@redhat.com, david.marchand@6wind.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH v3 16/40] ivshmem: Fix harmless misuse of Error X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We reuse errp after passing it host_memory_backend_get_memory(). If both host_memory_backend_get_memory() and the reuse set an error, the reuse will fail the assertion in error_setv(). Fortunately, host_memory_backend_get_memory() can't fail. Pass it &error_abort to make our assumption explicit, and to get the assertion failure in the right place should it become invalid. Signed-off-by: Markus Armbruster Reviewed-by: Marc-André Lureau --- hw/misc/ivshmem.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 0ac0238..299cf5b 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -842,7 +842,7 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error **errp) g_warning("size argument ignored with hostmem"); } - mr = host_memory_backend_get_memory(s->hostmem, errp); + mr = host_memory_backend_get_memory(s->hostmem, &error_abort); s->ivshmem_size = memory_region_size(mr); } else if (s->sizearg == NULL) { s->ivshmem_size = 4 << 20; /* 4 MB default */ @@ -907,7 +907,8 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error **errp) IVSHMEM_DPRINTF("using hostmem\n"); - mr = host_memory_backend_get_memory(MEMORY_BACKEND(s->hostmem), errp); + mr = host_memory_backend_get_memory(MEMORY_BACKEND(s->hostmem), + &error_abort); vmstate_register_ram(mr, DEVICE(s)); memory_region_add_subregion(&s->bar, 0, mr); pci_register_bar(PCI_DEVICE(s), 2, attr, &s->bar); @@ -1134,7 +1135,7 @@ static void ivshmem_check_memdev_is_busy(Object *obj, const char *name, { MemoryRegion *mr; - mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), errp); + mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), &error_abort); if (memory_region_is_mapped(mr)) { char *path = object_get_canonical_path_component(val); error_setg(errp, "can't use already busy memdev: %s", path);