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d=redhat.com; s=mimecast20190719; t=1675696135; h=from:from:sender:sender: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:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=vUjFMdmFFrm85/UE7Nl1gtakySM5KT+nVn6i6RhkC38=; b=VVrmI2K2WsWosI9rTfEeRGwsl9D2RVibC9z5ziRmcrCfq9PQqjBpj2A7nRcKJAvox11LlE nMsR04EjgNCn3kro3oklisOnb/Hba2zaQpWX01XfIDApIg8gh0b/BUvqPLv1HAjdygYIbt i+iGYyGdej8zPl5gqeBg4wE1JoAhOYQ= X-MC-Unique: PU9l2-HMPtqNJLsohfAf6Q-1 X-Original-To: libvir-list@listman.corp.redhat.com From: Michal Privoznik To: libvir-list@redhat.com Subject: [PATCH 2/2] virhostdevtest: Decrease possibility of uninitialized @subsys Date: Mon, 6 Feb 2023 16:08:28 +0100 Message-Id: <68f440c03bb50c9eb77b2d9ac9029277b6022451.1675696024.git.mprivozn@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libvir-list-bounces@redhat.com Sender: "libvir-list" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1675696137844100001 Content-Type: text/plain; charset="utf-8"; x-default="true" With the current way the myInit() is written, it's fairly easy to miss initialization of @subsys variable as the variable is allocated firstly on the stack and then it's assigned to hostdev[i] which was allocated using g_new0() (this it is containing nothing but all zeroes). Make the subsys point to the corresponding member in hostdev[i] from the start. This way only the important bits are overwritten and the rest stays initialized to zero. Signed-off-by: Michal Privoznik --- tests/virhostdevtest.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/tests/virhostdevtest.c b/tests/virhostdevtest.c index 92bafcbb49..1aed0d2b6d 100644 --- a/tests/virhostdevtest.c +++ b/tests/virhostdevtest.c @@ -123,23 +123,23 @@ myInit(void) size_t i; =20 for (i =3D 0; i < nhostdevs; i++) { - virDomainHostdevSubsys subsys =3D {0}; + virDomainHostdevSubsys *subsys; hostdevs[i] =3D virDomainHostdevDefNew(); if (!hostdevs[i]) goto cleanup; hostdevs[i]->mode =3D VIR_DOMAIN_HOSTDEV_MODE_SUBSYS; - subsys.type =3D VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI; - subsys.u.pci.addr.domain =3D 0; - subsys.u.pci.addr.bus =3D 0; - subsys.u.pci.addr.slot =3D i + 1; - subsys.u.pci.addr.function =3D 0; - subsys.u.pci.backend =3D VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO; - hostdevs[i]->source.subsys =3D subsys; + subsys =3D &hostdevs[i]->source.subsys; + subsys->type =3D VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI; + subsys->u.pci.addr.domain =3D 0; + subsys->u.pci.addr.bus =3D 0; + subsys->u.pci.addr.slot =3D i + 1; + subsys->u.pci.addr.function =3D 0; + subsys->u.pci.backend =3D VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO; } =20 for (i =3D 0; i < nhostdevs; i++) { - virDomainHostdevSubsys subsys =3D hostdevs[i]->source.subsys; - if (!(dev[i] =3D virPCIDeviceNew(&subsys.u.pci.addr))) + virDomainHostdevSubsys *subsys =3D &hostdevs[i]->source.subsys; + if (!(dev[i] =3D virPCIDeviceNew(&subsys->u.pci.addr))) goto cleanup; =20 virPCIDeviceSetStubDriver(dev[i], VIR_PCI_STUB_DRIVER_VFIO); --=20 2.39.1