lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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
Download Patch File Download Diff File Expand all files Collapse all files

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

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