From patchwork Tue Jul 19 17:02:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Dr. David Alan Gilbert" X-Patchwork-Id: 12922837 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id D0162C433EF for ; Tue, 19 Jul 2022 17:45:12 +0000 (UTC) Received: from localhost ([::1]:33636 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oDrHT-0000q8-L8 for qemu-devel@archiver.kernel.org; Tue, 19 Jul 2022 13:45:11 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42946) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDqcf-0006s0-7g for qemu-devel@nongnu.org; Tue, 19 Jul 2022 13:03:01 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:32180) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDqcd-0002xT-CV for qemu-devel@nongnu.org; Tue, 19 Jul 2022 13:03:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1658250177; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=C3RsTzpUpSmcwAiXumCHZkL1L95oYVF7nTyhzOb0/Tk=; b=c9NjfkX0GP8V+ZgzBz+gIXnurcP1k+ZYfrkiA2ItAdM5SsWdqm06h5c1aRqYQ8x7Ccz34n sPMv4nlefWasCiBJpAllzazEA6pkw43tT2Snc0PJm5gA+bSeP3o2T/ffVXbObvcRMGPT7H BX8ZuflxqvkGq4gQ5M/ak0Ag97hGBRQ= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-613-ioFdnXOHNgipgIAidS7b0w-1; Tue, 19 Jul 2022 13:02:55 -0400 X-MC-Unique: ioFdnXOHNgipgIAidS7b0w-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7B95E380673A; Tue, 19 Jul 2022 17:02:55 +0000 (UTC) Received: from dgilbert-t580.localhost (unknown [10.33.36.162]) by smtp.corp.redhat.com (Postfix) with ESMTP id 85B6840CFD0A; Tue, 19 Jul 2022 17:02:54 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, leobras@redhat.com, quintela@redhat.com, berrange@redhat.com, peterx@redhat.com, iii@linux.ibm.com, huangy81@chinatelecom.cn Subject: [PULL 24/29] migration: remove unreachable code after reading data Date: Tue, 19 Jul 2022 18:02:16 +0100 Message-Id: <20220719170221.576190-25-dgilbert@redhat.com> In-Reply-To: <20220719170221.576190-1-dgilbert@redhat.com> References: <20220719170221.576190-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Received-SPF: pass client-ip=170.10.129.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Daniel P. Berrangé The code calls qio_channel_read() in a loop when it reports QIO_CHANNEL_ERR_BLOCK. This code is reported when errno==EAGAIN. As such the later block of code will always hit the 'errno != EAGAIN' condition, making the final 'else' unreachable. Fixes: Coverity CID 1490203 Signed-off-by: Daniel P. Berrangé Message-Id: <20220627135318.156121-1-berrange@redhat.com> Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Dr. David Alan Gilbert --- migration/qemu-file.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/migration/qemu-file.c b/migration/qemu-file.c index 2f266b25cd..4f400c2e52 100644 --- a/migration/qemu-file.c +++ b/migration/qemu-file.c @@ -411,10 +411,8 @@ static ssize_t qemu_fill_buffer(QEMUFile *f) f->total_transferred += len; } else if (len == 0) { qemu_file_set_error_obj(f, -EIO, local_error); - } else if (len != -EAGAIN) { - qemu_file_set_error_obj(f, len, local_error); } else { - error_free(local_error); + qemu_file_set_error_obj(f, len, local_error); } return len;