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KVM: only clear irq_source_id if irqchip is present

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Otherwise kvm might attempt to dereference a NULL pointer.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-10-29 13:44:17 -02:00 committed by Avi Kivity
parent 2204ae3c96
commit e50212bb51
1 changed files with 4 additions and 1 deletions
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5
virt/kvm/irq_comm.c
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@ -243,6 +243,10 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
goto unlock;
}
clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
if (!irqchip_in_kernel(kvm))
goto unlock;
for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) {
clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]);
if (i >= 16)
@ -251,7 +255,6 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
clear_bit(irq_source_id, &pic_irqchip(kvm)->irq_states[i]);
#endif
}
clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
unlock:
mutex_unlock(&kvm->irq_lock);
}