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KVM: Properly lock PIT creation

Browse source 
Otherwise, two threads can create a PIT in parallel and cause a memory leak.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2009-01-05 15:21:42 +02:00
parent a77ab5ead5
commit 269e05e485
2 changed files with 6 additions and 2 deletions
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2
arch/x86/kvm/i8254.c
View file

@ -548,9 +548,7 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm)
if (!pit) if (!pit)
return NULL; return NULL;
mutex_lock(&kvm->lock);
pit->irq_source_id = kvm_request_irq_source_id(kvm); pit->irq_source_id = kvm_request_irq_source_id(kvm);
mutex_unlock(&kvm->lock);
if (pit->irq_source_id < 0) { if (pit->irq_source_id < 0) {
kfree(pit); kfree(pit);
return NULL; return NULL;

6
arch/x86/kvm/x86.c
View file

@ -1837,10 +1837,16 @@ long kvm_arch_vm_ioctl(struct file *filp,
goto out; goto out;
break; break;
case KVM_CREATE_PIT: case KVM_CREATE_PIT:
mutex_lock(&kvm->lock);
r = -EEXIST;
if (kvm->arch.vpit)
goto create_pit_unlock;
r = -ENOMEM; r = -ENOMEM;
kvm->arch.vpit = kvm_create_pit(kvm); kvm->arch.vpit = kvm_create_pit(kvm);
if (kvm->arch.vpit) if (kvm->arch.vpit)
r = 0; r = 0;
create_pit_unlock:
mutex_unlock(&kvm->lock);
break; break;
case KVM_IRQ_LINE: { case KVM_IRQ_LINE: {
struct kvm_irq_level irq_event; struct kvm_irq_level irq_event;