| Date | Wed, 16 Dec 2009 19:55:29 -0800 | From | Greg KH <> | Subject | [032/151] KVM: fix irq_source_id size verification |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: Marcelo Tosatti <mtosatti@redhat.com>
commit cd5a2685de4a642fd0bd763e8c19711ef08dbe27 upstream.
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> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- virt/kvm/irq_comm.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
--- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -205,10 +205,9 @@ int kvm_request_irq_source_id(struct 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"); return -EFAULT; } @@ -228,7 +227,7 @@ void kvm_free_irq_source_id(struct kvm * 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"); return; }
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