From c9e21f998793b62a58406ead0286b09760fa7764 Mon Sep 17 00:00:00 2001 From: Zhao Liu Date: Mon, 11 Mar 2024 11:38:11 +0800 Subject: [PATCH] hw/vfio/ap: Fix missing ERRP_GUARD() for error_prepend() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit As the comment in qapi/error, passing @errp to error_prepend() requires ERRP_GUARD(): * = Why, when and how to use ERRP_GUARD() = * * 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: Cédric 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: Cédric Le Goater Message-ID: <20240311033822.3142585-19-zhao1.liu@linux.intel.com> Signed-off-by: Thomas Huth --- hw/vfio/ap.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c index e157aa1ff7..7c4caa5938 100644 --- a/hw/vfio/ap.c +++ b/hw/vfio/ap.c @@ -155,6 +155,7 @@ static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev, static void vfio_ap_realize(DeviceState *dev, Error **errp) { + ERRP_GUARD(); int ret; Error *err = NULL; VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); -- 2.11.4.GIT