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authorMarcelo Tosatti <mtosatti@redhat.com>2010-01-12 16:42:09 -0200
committerMarcelo Tosatti <mtosatti@redhat.com>2010-01-25 12:26:38 -0200
commitd72118cecabbb76b96b77107a50c74d1bb36c0c1 (patch)
treebb000f670a2d60ddca4439723debd2321b1738ca /virt
parentf1d1c309f35e9b0fb961cffd70fbd04f450ec47c (diff)
downloadlinux-2.6.34-ux500-d72118cecabbb76b96b77107a50c74d1bb36c0c1.tar.gz
KVM: properly check max PIC pin in irq route setup
Otherwise memory beyond irq_states[16] might be accessed. Noticed by Juan Quintela. Cc: stable@kernel.org Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Acked-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/irq_comm.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 9b077342ab5..9fd5b3ebc51 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -302,6 +302,7 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
{
int r = -EINVAL;
int delta;
+ unsigned max_pin;
struct kvm_kernel_irq_routing_entry *ei;
struct hlist_node *n;
@@ -322,12 +323,15 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
switch (ue->u.irqchip.irqchip) {
case KVM_IRQCHIP_PIC_MASTER:
e->set = kvm_set_pic_irq;
+ max_pin = 16;
break;
case KVM_IRQCHIP_PIC_SLAVE:
e->set = kvm_set_pic_irq;
+ max_pin = 16;
delta = 8;
break;
case KVM_IRQCHIP_IOAPIC:
+ max_pin = KVM_IOAPIC_NUM_PINS;
e->set = kvm_set_ioapic_irq;
break;
default:
@@ -335,7 +339,7 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
}
e->irqchip.irqchip = ue->u.irqchip.irqchip;
e->irqchip.pin = ue->u.irqchip.pin + delta;
- if (e->irqchip.pin >= KVM_IOAPIC_NUM_PINS)
+ if (e->irqchip.pin >= max_pin)
goto out;
rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
break;