diff mbox

[1/1] KVM: fix lock imbalance

Message ID 1253864018-7547-1-git-send-email-jirislaby@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jiri Slaby Sept. 25, 2009, 7:33 a.m. UTC 
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: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
---
 virt/kvm/irq_comm.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

Comments

Avi Kivity Sept. 27, 2009, 8:42 a.m. UTC | #1 
On 09/25/2009 10:33 AM, Jiri Slaby wrote:
> 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.
>    

Applied, thanks.
diff mbox

Patch

diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 15a83b9..00c68d2 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);
 }