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| author | Jiri Slaby <jirislaby@gmail.com> | 2009-09-25 09:33:38 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-12-03 09:32:12 +0200 |
| commit | 0c6ddcebd8303ada6faefa6f72ac18b6230320c4 (patch) | |
| tree | f9ad607a5c433b310fe78adbf934d465de06cc94 /virt/kvm/irq_comm.c | |
| parent | e935d48e1b49451490218e1181d9834176200955 (diff) | |
| download | lwn-0c6ddcebd8303ada6faefa6f72ac18b6230320c4.tar.gz lwn-0c6ddcebd8303ada6faefa6f72ac18b6230320c4.zip | |
KVM: fix lock imbalance in kvm_*_irq_source_id()
Stanse found 2 lock imbalances in kvm_request_irq_source_id and
kvm_free_irq_source_id. They omit to unlock kvm->irq_lock on fail paths.
Fix that by adding unlock labels at the end of the functions and jump
there from the fail paths.
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: 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.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 15a83b93566d..00c68d298579 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -220,11 +220,13 @@ int kvm_request_irq_source_id(struct kvm *kvm) if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); - return -EFAULT; + irq_source_id = -EFAULT; + goto unlock; } ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); set_bit(irq_source_id, bitmap); +unlock: mutex_unlock(&kvm->irq_lock); return irq_source_id; @@ -240,7 +242,7 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) if (irq_source_id < 0 || irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); - return; + goto unlock; } for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) { clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]); @@ -251,6 +253,7 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) #endif } clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); +unlock: mutex_unlock(&kvm->irq_lock); } |