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a="29976271" X-IronPort-AV: E=Sophos;i="6.09,230,1716274800"; d="scan'208";a="29976271" X-CSE-ConnectionGUID: rXClp3zfTGq8951o0WZXxA== X-CSE-MsgGUID: BtksmpK5SHe9ANujf6rF3w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,230,1716274800"; d="scan'208";a="51993759" From: Zhao Liu To: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Laurent Vivier , Markus Armbruster Cc: qemu-devel@nongnu.org, Zhao Liu Subject: [PATCH v2] hw/nubus/nubus-virtio-mmio: Fix missing ERRP_GUARD() in nubus_virtio_mmio_realize() Date: Wed, 24 Jul 2024 00:18:02 +0800 Message-Id: <20240723161802.1377985-1-zhao1.liu@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=198.175.65.11; envelope-from=zhao1.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.133, 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_PASS=-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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1721750608539116600 Content-Type: text/plain; charset="utf-8" According to the comment in qapi/error.h, dereferencing @errp requires ERRP_GUARD(): * =3D Why, when and how to use ERRP_GUARD() =3D * * Without ERRP_GUARD(), use of the @errp parameter is restricted: * - It must not be dereferenced, because it may be null. ... * ERRP_GUARD() lifts these restrictions. * * To use ERRP_GUARD(), add it right at the beginning of the function. * @errp can then be used without worrying about the argument being * NULL or &error_fatal. * * Using it when it's not needed is safe, but please avoid cluttering * the source with useless code. In nubus_virtio_mmio_realize(), @errp is dereferenced without ERRP_GUARD(). Although nubus_virtio_mmio_realize() - as a DeviceClass.realize() method - is never passed a null @errp argument, it should follow the rules on @errp usage. Add the ERRP_GUARD() there. Reviewed-by: Markus Armbruster Signed-off-by: Zhao Liu --- v2: Used Markus' words in commit message and added his r/b tag. --- hw/nubus/nubus-virtio-mmio.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/nubus/nubus-virtio-mmio.c b/hw/nubus/nubus-virtio-mmio.c index 58a63c84d0be..a5558d3ec28b 100644 --- a/hw/nubus/nubus-virtio-mmio.c +++ b/hw/nubus/nubus-virtio-mmio.c @@ -23,6 +23,7 @@ static void nubus_virtio_mmio_set_input_irq(void *opaque,= int n, int level) =20 static void nubus_virtio_mmio_realize(DeviceState *dev, Error **errp) { + ERRP_GUARD(); NubusVirtioMMIODeviceClass *nvmdc =3D NUBUS_VIRTIO_MMIO_GET_CLASS(dev); NubusVirtioMMIO *s =3D NUBUS_VIRTIO_MMIO(dev); NubusDevice *nd =3D NUBUS_DEVICE(dev); --=20 2.34.1