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Tue, 30 Jun 2020 09:03:57 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-112-121.ams2.redhat.com [10.36.112.121]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5C50C741B0; Tue, 30 Jun 2020 09:03:57 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 1E3841138480; Tue, 30 Jun 2020 11:03:52 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH v3 20/26] x86: Fix x86_cpu_new() error handling Date: Tue, 30 Jun 2020 11:03:45 +0200 Message-Id: <20200630090351.1247703-21-armbru@redhat.com> In-Reply-To: <20200630090351.1247703-1-armbru@redhat.com> References: <20200630090351.1247703-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.81; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/30 02:00:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Igor Mammedov , Richard Henderson , Eduardo Habkost , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. x86_cpu_new() is wrong that way: it passes &local_err to object_property_set_uint() without checking it, and then to qdev_realize(). If both fail, we'll trip error_setv()'s assertion. To assess the bug's impact, we'd need to figure out how to make both calls fail. Too much work for ignorant me, sorry. Fix by checking for failure right away. Cc: Igor Mammedov Cc: Paolo Bonzini Cc: Richard Henderson Cc: Eduardo Habkost Signed-off-by: Markus Armbruster --- hw/i386/x86.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/hw/i386/x86.c b/hw/i386/x86.c index 34229b45c7..93f7371a56 100644 --- a/hw/i386/x86.c +++ b/hw/i386/x86.c @@ -118,14 +118,16 @@ uint32_t x86_cpu_apic_id_from_index(X86MachineState *x86ms, void x86_cpu_new(X86MachineState *x86ms, int64_t apic_id, Error **errp) { - Object *cpu = NULL; Error *local_err = NULL; - - cpu = object_new(MACHINE(x86ms)->cpu_type); + Object *cpu = object_new(MACHINE(x86ms)->cpu_type); object_property_set_uint(cpu, apic_id, "apic-id", &local_err); + if (local_err) { + goto out; + } qdev_realize(DEVICE(cpu), NULL, &local_err); +out: object_unref(cpu); error_propagate(errp, local_err); }