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KVM: add KVM_USERSPACE_IRQ_SOURCE_ID assertions

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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 <markmc@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Mark McLoughlin 2008-12-01 13:57:48 +00:00 committed by Avi Kivity
parent f29b2673d3
commit 61552367b2
1 changed files with 10 additions and 4 deletions
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14
virt/kvm/irq_comm.c
View file

@ -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;