Commit 28a6fdab authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Marcelo Tosatti
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KVM: x86: drop parameter validation in ioapic/pic 



We validate irq pin number when routing is setup, so
code handling illegal irq # in pic and ioapic on each injection
is never called.
Drop it, replace with BUG_ON to catch out of bounds access bugs.

Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent dbcb4e79

arch/x86/kvm/i8259.c

+9 −9
Original line number Diff line number Diff line
@@ -190,17 +190,17 @@ void kvm_pic_update_irq(struct kvm_pic *s) 


int kvm_pic_set_irq(struct kvm_pic *s, int irq, int irq_source_id, int level)

{

	int ret = -1;

	int ret, irq_level;



	BUG_ON(irq < 0 || irq >= PIC_NUM_PINS);



	pic_lock(s);

	if (irq >= 0 && irq < PIC_NUM_PINS) {

		int irq_level = __kvm_irq_line_state(&s->irq_states[irq],

	irq_level = __kvm_irq_line_state(&s->irq_states[irq],

					 irq_source_id, level);

	ret = pic_set_irq1(&s->pics[irq >> 3], irq & 7, irq_level);

	pic_update_irq(s);

	trace_kvm_pic_set_irq(irq >> 3, irq & 7, s->pics[irq >> 3].elcr,

			      s->pics[irq >> 3].imr, ret == 0);

	}

	pic_unlock(s);



	return ret;

virt/kvm/ioapic.c

+19 −18
Original line number Diff line number Diff line
@@ -197,18 +197,20 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, 
	u32 old_irr;

	u32 mask = 1 << irq;

	union kvm_ioapic_redirect_entry entry;

	int ret = 1;

	int ret, irq_level;



	BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);



	spin_lock(&ioapic->lock);

	old_irr = ioapic->irr;

	if (irq >= 0 && irq < IOAPIC_NUM_PINS) {

		int irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],

	irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],

					 irq_source_id, level);

	entry = ioapic->redirtbl[irq];

	irq_level ^= entry.fields.polarity;

		if (!irq_level)

	if (!irq_level) {

		ioapic->irr &= ~mask;

		else {

		ret = 1;

	} else {

		int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);

		ioapic->irr |= mask;

		if ((edge && old_irr != ioapic->irr) ||
@@ -218,7 +220,6 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, 
			ret = 0; /* report coalesced interrupt */

	}

	trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);

	}

	spin_unlock(&ioapic->lock);



	return ret;

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