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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2009-10-29 13:44:17 -0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-12-03 09:32:23 +0200 |
| commit | e50212bb51356f0df48d6cce0aae5acf41df336d (patch) | |
| tree | 095f3af5f642936ef5dae5415d8817e6337a179e /virt | |
| parent | 2204ae3c96e9a1fed50f7ee19ce092e69d7dfe82 (diff) | |
| download | lwn-e50212bb51356f0df48d6cce0aae5acf41df336d.tar.gz lwn-e50212bb51356f0df48d6cce0aae5acf41df336d.zip | |
KVM: only clear irq_source_id if irqchip is present
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>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/irq_comm.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 0d454d352717..9b077342ab54 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -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); } |