[PATCH 14/35] KVM: fix irq_source_id size verification

Avi Kivity
2009-11-19T13:35:08Z

From: Marcelo Tosatti <mtosatti@redhat.com>

find_first_zero_bit works with bit numbers, not bytes.

Fixes

https://sourceforge.net/tracker/?func=detail&aid=2847560&group_id=180599&atid=893831

Reported-by: "Xu, Jiajun" <jiajun.xu@intel.com>
Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
virt/kvm/irq_comm.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 00c68d2..0d454d3 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -215,10 +215,9 @@ int kvm_request_irq_source_id(struct kvm *kvm)
int irq_source_id;

mutex_lock(&kvm->irq_lock);
- irq_source_id = find_first_zero_bit(bitmap,
- sizeof(kvm->arch.irq_sources_bitmap));
+ irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);

- if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
+ if (irq_source_id >= BITS_PER_LONG) {
printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
irq_source_id = -EFAULT;
goto unlock;
@@ -240,7 +239,7 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)

mutex_lock(&kvm->irq_lock);
if (irq_source_id < 0 ||
- irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
+ irq_source_id >= BITS_PER_LONG) {
printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
goto unlock;
}
--
1.6.5.2