From nobody Mon Feb 9 03:29:16 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1689799193; cv=none; d=zohomail.com; s=zohoarc; b=HmoVlJ/fvDiD+fj786e5Xe3FQMzxWNZmxpvpx0KPnhfIbz1U9QhdPhxhTYuDQUACNLfY3/drU9uqbRW6+SUaNQrMzjnvk9lJJ2S32FLLa3gJ3hbgAwsn5PgObxG3pVWMN6rP9F+e1yW1cMukbFXSfaNbj6taS4A4NleV58HNIxA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1689799193; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=J0+3VktJojW0nG88wPYa4HziBJCTmpIA6XhRPIN8Sqg=; b=dKmaSo+Qf8ObP+bYJ7kYp1kO0GdXMKYitL1JJlSf/6QhOWXVTQKE+k0Dl8AJfltMhXKh5XortZA1FbDONoDM2T/6wJPFyZjhByRw5zX/KkmfEVm6bmE4zY0xdCktnerxYcXNc35LuqYhGassDg/vWIO1RgrxoBCJCBlYhynDGPI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1689799193369639.8992713800544; Wed, 19 Jul 2023 13:39:53 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qMDv8-0005xU-NF; Wed, 19 Jul 2023 16:37:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qMDv6-0005vS-LX for qemu-devel@nongnu.org; Wed, 19 Jul 2023 16:37:12 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qMDv4-0001nd-Ax for qemu-devel@nongnu.org; Wed, 19 Jul 2023 16:37:12 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-558-Zhke2vMbM9Go6hr4xLLPaQ-1; Wed, 19 Jul 2023 16:37:05 -0400 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8F7CF185A78F; Wed, 19 Jul 2023 20:37:05 +0000 (UTC) Received: from green.redhat.com (unknown [10.2.16.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1C3F54CD0F5; Wed, 19 Jul 2023 20:37:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1689799029; 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=J0+3VktJojW0nG88wPYa4HziBJCTmpIA6XhRPIN8Sqg=; b=HucW7DBha3jRaP8Lc3DnIsqlG7wM4dnyI3/sdcqvo6aGyS4EkgXU4ppBYz71z9zTw+D2Qh ml5ByfuTsNYlrFbxuRdurbMFQaUxD8Z3VCU77LATtEFGf5DoKwjWiiQR4jowPSO4wP9rLg kuwhsTodGuThGXH3W/Bktc7szl1abUA= X-MC-Unique: Zhke2vMbM9Go6hr4xLLPaQ-1 From: Eric Blake To: qemu-devel@nongnu.org Cc: "Denis V. Lunev" , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org (open list:Network Block Dev...) Subject: [PULL 05/14] qemu-nbd: handle dup2() error when qemu-nbd finished setup process Date: Wed, 19 Jul 2023 15:27:42 -0500 Message-ID: <20230719202736.2675295-21-eblake@redhat.com> In-Reply-To: <20230719202736.2675295-16-eblake@redhat.com> References: <20230719202736.2675295-16-eblake@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1689799194243100001 Content-Type: text/plain; charset="utf-8" From: "Denis V. Lunev" Fail on error, we are in trouble. Signed-off-by: Denis V. Lunev CC: Eric Blake CC: Vladimir Sementsov-Ogievskiy Message-ID: <20230717145544.194786-6-den@openvz.org> Reviewed-by: Eric Blake [eblake: avoid intermediate variable] Signed-off-by: Eric Blake --- qemu-nbd.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/qemu-nbd.c b/qemu-nbd.c index f27613cb572..e30c9ac1793 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -323,7 +323,11 @@ static void *nbd_client_thread(void *arg) opts->device, srcpath); } else { /* Close stderr so that the qemu-nbd process exits. */ - dup2(STDOUT_FILENO, STDERR_FILENO); + if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) { + error_report("Could not set stderr to /dev/null: %s", + strerror(errno)); + exit(EXIT_FAILURE); + } } if (nbd_client(fd) < 0) { @@ -1171,7 +1175,11 @@ int main(int argc, char **argv) } if (fork_process) { - dup2(STDOUT_FILENO, STDERR_FILENO); + if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) { + error_report("Could not set stderr to /dev/null: %s", + strerror(errno)); + exit(EXIT_FAILURE); + } } state =3D RUNNING; --=20 2.41.0