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authorMarcelo Tosatti <mtosatti@redhat.com>2009-10-29 11:44:17 -0400
committerAvi Kivity <avi@redhat.com>2009-12-03 02:32:23 -0500
commite50212bb51356f0df48d6cce0aae5acf41df336d (patch)
tree095f3af5f642936ef5dae5415d8817e6337a179e /virt/kvm/irq_comm.c
parent2204ae3c96e9a1fed50f7ee19ce092e69d7dfe82 (diff)
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/kvm/irq_comm.c')
-rw-r--r--virt/kvm/irq_comm.c5
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)
243 printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); 243 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
244 goto unlock; 244 goto unlock;
245 } 245 }
246 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
247 if (!irqchip_in_kernel(kvm))
248 goto unlock;
249
246 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) { 250 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) {
247 clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]); 251 clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]);
248 if (i >= 16) 252 if (i >= 16)
@@ -251,7 +255,6 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
251 clear_bit(irq_source_id, &pic_irqchip(kvm)->irq_states[i]); 255 clear_bit(irq_source_id, &pic_irqchip(kvm)->irq_states[i]);
252#endif 256#endif
253 } 257 }
254 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
255unlock: 258unlock:
256 mutex_unlock(&kvm->irq_lock); 259 mutex_unlock(&kvm->irq_lock);
257} 260}