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[2/4] KVM: x86: fix APIC physical destination wrapping

Message ID 1417114994-25235-3-git-send-email-rkrcmar@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Radim Krčmář Nov. 27, 2014, 7:03 p.m. UTC 
x2apic allows destinations > 0xff and we don't want them delivered to
lower APICs.  They are correctly handled by doing nothing.

Signed-off-by: Radim Kr?má? <rkrcmar@redhat.com>
---
 arch/x86/kvm/lapic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e8ad09d..049d30f 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -691,7 +691,10 @@  bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
 		goto out;
 
 	if (irq->dest_mode == 0) { /* physical mode */
-		dst = &map->phys_map[irq->dest_id & 0xff];
+		if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
+			goto out;
+
+		dst = &map->phys_map[irq->dest_id];
 	} else {
 		u32 mda = irq->dest_id << (32 - map->ldr_bits);