From mboxrd@z Thu Jan 1 00:00:00 1970 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 E6366C761A6 for ; Tue, 4 Apr 2023 18:23:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pjlIR-00039d-K4; Tue, 04 Apr 2023 14:22:19 -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 1pjlIP-00039B-AQ for qemu-devel@nongnu.org; Tue, 04 Apr 2023 14:22:17 -0400 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 1pjlIK-0008JL-V3 for qemu-devel@nongnu.org; Tue, 04 Apr 2023 14:22:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Lu8jZhJaTM8m5Xr4ZDYrxrjU1MfxECiW0p4YuCvnGkU=; b=p1Vzi9eB2flWEAyLvCdP73AYed 5cxIUcKX2e4Hj3GBqR/JPEJjgr/GVER5EDKP7iF5VfmYr+uSi6nhaNXHLE0ZBmwMv4+e4MvoiqtHd 8RCwRAdlISuh7VlCxlnbuIT/lWgZs+NR+ScqzUTbFVkCUEYsq3XgGfLPXjgGpmYQzN5xEBK2HFpA+ 7SXBDrfuAsizV++3ptudrG4I0Y07Mnw6egH2DTCSyYmZVQ15SPHHIjddJwp6RlnIhyem75hDjwrsb ojy6qE07qp6nad4Rw2PlbthbVobe25Zyo9JhYOsInVqt28A/RHbe7XIFHX4bxocciULrlgR3Uzf0w Uf/iNuMQ==; Received: from [2001:8b0:10b:5:99d7:d5a0:55b7:41c3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pjlIB-00Fbbn-KB; Tue, 04 Apr 2023 18:22:03 +0000 Message-ID: <59486d12e4c22fccf5fad4a34cfae68547c759c2.camel@infradead.org> Subject: Re: [PULL 13/27] hw/xen: Add xenstore operations to allow redirection to internal emulation From: David Woodhouse To: Peter Maydell Cc: qemu-devel@nongnu.org, Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora , Stefano Stabellini , vikram.garhwal@amd.com, Anthony Perard , xen-devel@lists.xenproject.org, Juan Quintela , "Dr . David Alan Gilbert" Date: Tue, 04 Apr 2023 19:21:53 +0100 In-Reply-To: References: <20230307182707.2298618-1-dwmw2@infradead.org> <20230307182707.2298618-14-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-5qfME1/1OsAkh+xXm9Bs" User-Agent: Evolution 3.44.4-0ubuntu1 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: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+8e7372aa539f26de88ef+7163+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 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-5qfME1/1OsAkh+xXm9Bs Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-04-04 at 18:45 +0100, Peter Maydell wrote: > On Tue, 4 Apr 2023 at 18:45, David Woodhouse > wrote: > >=20 > > On Tue, 2023-04-04 at 18:35 +0100, Peter Maydell wrote: > > > On Tue, 7 Mar 2023 at 18:27, David Woodhouse > > > > > > wrote: > > > >=20 > > > > From: Paul Durrant > > > >=20 > > > > Signed-off-by: Paul Durrant > > > > Signed-off-by: David Woodhouse > > > > Reviewed-by: Paul Durrant > > > > --- > > >=20 > > > Hi; Coverity points out a memory leak in this code (CID 1508098): > > >=20 > > > > +static struct qemu_xs_handle *libxenstore_open(void) > > > > +{ > > > > +=C2=A0=C2=A0=C2=A0 struct xs_handle *xsh =3D xs_open(0); > > > > +=C2=A0=C2=A0=C2=A0 struct qemu_xs_handle *h =3D g_new0(struct qemu= _xs_handle, > > > > 1); > > >=20 > > > Here we allocate memory... > > >=20 > > > > + > > > > +=C2=A0=C2=A0=C2=A0 if (!xsh) { > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return NULL; > > >=20 > > > ...but here we can return without freeing it... > > >=20 > > > > +=C2=A0=C2=A0=C2=A0 } > > > > + > > > > +=C2=A0=C2=A0=C2=A0 h =3D g_new0(struct qemu_xs_handle, 1); > > >=20 > > > ...and here we allocate a second time and overwrite the > > > pointer to the first allocation. > > >=20 > > > Deleting the first call to g_new0() would fix both of these. > >=20 > > Indeed, thanks. Do you want a > >=20 > > Reviewed-by: David Woodhouse > >=20 > > or would you prefer me to submit the actual patch as described? >=20 > If you could submit the patch that would be easiest -- you're in > a better position to test it. I've been getting Paul to test the parts on actual Xen, so I'll send it and let him test. --=-5qfME1/1OsAkh+xXm9Bs Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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