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Commit e50212bb authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
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KVM: only clear irq_source_id if irqchip is present 



Otherwise kvm might attempt to dereference a NULL pointer.

Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 2204ae3c

virt/kvm/irq_comm.c

+4 −1
Original line number Diff line number Diff line
@@ -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);

}