diff options
| author | Avi Kivity <avi@redhat.com> | 2009-01-05 15:21:42 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-03-24 11:03:01 +0200 |
| commit | 269e05e48502f1cc06802e9fba90f5100dd6bb0d (patch) | |
| tree | 9b3501dc1f5e137c2dca7eacf15c0353f627be97 /arch/x86/kvm/x86.c | |
| parent | a77ab5ead5c1fef2c6c5a9b3cf3765e52643a2aa (diff) | |
KVM: Properly lock PIT creation
Otherwise, two threads can create a PIT in parallel and cause a memory leak.
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a1f14611f4b..6fbc3460337 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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; |