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10 Mar 2024 20:25:38 -0700 Received: from liuzhao-optiplex-7080.sh.intel.com ([10.239.160.36]) by fmviesa003.fm.intel.com with ESMTP; 10 Mar 2024 20:25:35 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1710127554; x=1741663554; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=vZshy9OBrsUTeZ3ltvu9CPOrZHXEn+0ngl/QLE5aqVA=; b=MsqFjWKYa7qlZNYRnlveVAgH+qHNz40U3OhLFkxg+iYGh1vbUPjyd/TE J3lfyfDnxBJ5Xvlrgue9S5BoJc5o759aDP6B+cV+XRfrpZ7JqCAgfEmT5 H3xY3h8sEkhwdjtJLKFitu4HItcXfca4s5p4O9R23UxVWbHfFW6/dZNOp HI+bEyiGBdsA56qCU01Z80KOKkU4oKBDcAAmHUMwlseNCQL00NkR1F2H6 oASXzxNV3NBhsu5CGco8OoM/6cyW7lZip7BwjrrFrAoocT8r+fi/J0Qws ivex6PK1kvt14uebQBsEEaMjiqd3Vu8MXyrFZQSg5L4GehxrebRELWYyi w==; X-IronPort-AV: E=McAfee;i="6600,9927,11009"; a="22229745" X-IronPort-AV: E=Sophos;i="6.07,115,1708416000"; d="scan'208";a="22229745" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,115,1708416000"; d="scan'208";a="15593992" From: Zhao Liu To: Thomas Huth , Markus Armbruster , Michael Roth , Michael Tokarev , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org Cc: qemu-trivial@nongnu.org, Zhao Liu , Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Tony Krowiak , Halil Pasic , Jason Herne , qemu-s390x@nongnu.org Subject: [PATCH v2 18/29] hw/vfio/ap: Fix missing ERRP_GUARD() for error_prepend() Date: Mon, 11 Mar 2024 11:38:11 +0800 Message-Id: <20240311033822.3142585-19-zhao1.liu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240311033822.3142585-1-zhao1.liu@linux.intel.com> References: <20240311033822.3142585-1-zhao1.liu@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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: none client-ip=198.175.65.10; envelope-from=zhao1.liu@linux.intel.com; helo=mgamail.intel.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.945, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1710127733248100003 From: Zhao Liu As the comment in qapi/error, passing @errp to error_prepend() requires ERRP_GUARD(): * =3D Why, when and how to use ERRP_GUARD() =3D * * Without ERRP_GUARD(), use of the @errp parameter is restricted: ... * - It should not be passed to error_prepend(), error_vprepend() or * error_append_hint(), because that doesn't work with &error_fatal. * 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. ERRP_GUARD() could avoid the case when @errp is &error_fatal, the user can't see this additional information, because exit() happens in error_setg earlier than information is added [1]. The vfio_ap_realize() passes @errp to error_prepend(), and as a DeviceClass.realize method, there are too many possible callers to check the impact of this defect; it may or may not be harmless. Thus it is necessary to protect @errp with ERRP_GUARD(). To avoid the issue like [1] said, add missing ERRP_GUARD() at the beginning of this function. [1]: Issue description in the commit message of commit ae7c80a7bd73 ("error: New macro ERRP_GUARD()"). Cc: Alex Williamson Cc: "C=C3=A9dric Le Goater" Cc: Tony Krowiak Cc: Halil Pasic Cc: Jason Herne Cc: Thomas Huth Cc: qemu-s390x@nongnu.org Signed-off-by: Zhao Liu Reviewed-by: C=C3=A9dric Le Goater --- v2: Use Markus' sentence to polish commit message. (Markus) --- hw/vfio/ap.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c index e157aa1ff79c..7c4caa593863 100644 --- a/hw/vfio/ap.c +++ b/hw/vfio/ap.c @@ -155,6 +155,7 @@ static void vfio_ap_unregister_irq_notifier(VFIOAPDevic= e *vapdev, =20 static void vfio_ap_realize(DeviceState *dev, Error **errp) { + ERRP_GUARD(); int ret; Error *err =3D NULL; VFIOAPDevice *vapdev =3D VFIO_AP_DEVICE(dev); --=20 2.34.1