From nobody Tue May 21 17:24:42 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1699543870801542.1268112350657; Thu, 9 Nov 2023 07:31:10 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r16zW-0007rP-AM; Thu, 09 Nov 2023 10:30:46 -0500 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 1r16zS-0007iH-5T; Thu, 09 Nov 2023 10:30:42 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r16zN-0003MD-SC; Thu, 09 Nov 2023 10:30:41 -0500 Received: from [2001:8b0:10b:5:e60c:fbc4:6b73:8eff] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r16zI-0080Jc-Ho; Thu, 09 Nov 2023 15:30:33 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=YNZrzaqqF9dIWOsyly6LCz18pJYLR22j/p8dMcADsMg=; b=JsCckEeibO4jmHHALfpzRRyyfk SOnYQjZMKwxGsalgnmI7c/5cQKr8lAl+sGdhI8ufg+uK8ZCzS6FwR0gml0IgFvmvY1J80/S4cFL9Y 2wDea/EXusReOZOXrKyg8+wIRc8M0TU+eKyOkC4bmn6CMgOm1aXJj38vTotAD0NZggZI1hYV+Wawm wZYYhK1XfNrXUhIX6KZz5tLhkx6oZ46IUFDF4HpUGk1kAJxyM6YzttxUlG0ndjI/sS7YCmQYiEelZ i52jc46/lahHad9dnjVcR8m72jsF2NNtK3seL2p8GZt8uLmqoesi+cqMRUBaXOk/yiKyHhg8+HRvl dEUCN4tg==; Message-ID: <1c312ba88e0928527dad6bc2e1b73d8cfe4b7f48.camel@infradead.org> Subject: [PATCH] hw/xen: clean up xen_block_find_free_vdev() to avoid Coverity false positive From: David Woodhouse To: Peter Maydell , qemu-devel@nongnu.org Cc: Stefano Stabellini , Anthony Perard , Paul Durrant , Kevin Wolf , Hanna Reitz , xen-devel@lists.xenproject.org, qemu-block@nongnu.org Date: Thu, 09 Nov 2023 15:30:32 +0000 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-02mhxRPaxKZDyZCmug9W" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html 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: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+c182118e23cc89d32fc1+7382+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=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-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1699543873054100005 --=-02mhxRPaxKZDyZCmug9W Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse Coverity couldn't see that nr_existing was always going to be zero when qemu_xen_xs_directory() returned NULL in the ENOENT case (CID 1523906). Perhaps more to the point, neither could Peter at first glance. Improve the code to hopefully make it clearer to Coverity and human reviewers alike. Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- =C2=A0hw/block/xen-block.c | 24 +++++++++++++++++++++--- =C2=A01 file changed, 21 insertions(+), 3 deletions(-) diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c index 6d64ede94f..aed1d5c330 100644 --- a/hw/block/xen-block.c +++ b/hw/block/xen-block.c @@ -91,9 +91,27 @@ static bool xen_block_find_free_vdev(XenBlockDevice *blo= ckdev, Error **errp) =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 existing_frontends =3D qemu_xen_xs_directory(xenbu= s->xsh, XBT_NULL, fe_path, =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &nr_existing); -=C2=A0=C2=A0=C2=A0 if (!existing_frontends && errno !=3D ENOENT) { -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 error_setg_errno(errp, errno, "= cannot read %s", fe_path); -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return false; +=C2=A0=C2=A0=C2=A0 if (!existing_frontends) { +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (errno =3D=3D ENOENT) { +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= If the frontend directory doesn't exist because there are +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= no existing vbd devices, that's fine. Just ensure that we +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= don't dereference the NULL existing_frontends pointer, by +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= checking that nr_existing is zero so the loop below is not +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= entered. +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= In fact this is redundant since nr_existing is initialized +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= to zero, but setting it again here makes it abundantly clear +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= to Coverity, and to the human reader who doesn't know the +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= semantics of qemu_xen_xs_directory() off the top of their +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *= head. +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 nr_exis= ting =3D 0; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } else { +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* All = other errors accessing the frontend directory are fatal. */ +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 error_s= etg_errno(errp, errno, "cannot read %s", fe_path); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return = false; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } =C2=A0=C2=A0=C2=A0=C2=A0 } =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 memset(used_devs, 0, sizeof(used_devs)); --=20 2.34.1 --=-02mhxRPaxKZDyZCmug9W Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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