From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755992AbYLNIMl (ORCPT ); Sun, 14 Dec 2008 03:12:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754392AbYLNIHc (ORCPT ); Sun, 14 Dec 2008 03:07:32 -0500 Received: from mx2.redhat.com ([66.187.237.31]:59921 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753022AbYLNIHP (ORCPT ); Sun, 14 Dec 2008 03:07:15 -0500 From: Avi Kivity To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Mark McLoughlin Subject: [PATCH 17/36] KVM: add KVM_USERSPACE_IRQ_SOURCE_ID assertions Date: Sun, 14 Dec 2008 10:06:50 +0200 Message-Id: <1229242029-13410-18-git-send-email-avi@redhat.com> In-Reply-To: <1229242029-13410-1-git-send-email-avi@redhat.com> References: <1229242029-13410-1-git-send-email-avi@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark McLoughlin Make sure kvm_request_irq_source_id() never returns KVM_USERSPACE_IRQ_SOURCE_ID. Likewise, check that kvm_free_irq_source_id() never accepts KVM_USERSPACE_IRQ_SOURCE_ID. Signed-off-by: Mark McLoughlin Signed-off-by: Avi Kivity --- virt/kvm/irq_comm.c | 14 ++++++++++---- 1 files changed, 10 insertions(+), 4 deletions(-) diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index db75045..aa5d1e5 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -72,11 +72,15 @@ int kvm_request_irq_source_id(struct kvm *kvm) unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; int irq_source_id = find_first_zero_bit(bitmap, sizeof(kvm->arch.irq_sources_bitmap)); + if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); - irq_source_id = -EFAULT; - } else - set_bit(irq_source_id, bitmap); + return -EFAULT; + } + + ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); + set_bit(irq_source_id, bitmap); + return irq_source_id; } @@ -84,7 +88,9 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) { int i; - if (irq_source_id <= 0 || + ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); + + if (irq_source_id < 0 || irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); return; -- 1.6.0.3