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: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
Changes from v1:
add BUG_ON at Gleb's suggestion
arch/x86/kvm/i8259.c | 18 +++++++++---------
virt/kvm/ioapic.c | 37 +++++++++++++++++++------------------
2 files changed, 28 insertions(+), 27 deletions(-)
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index e498b18..90c84f9 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -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_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);
- }
+ 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;
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index ef61d52..cfb7e4d 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -197,28 +197,29 @@ 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_source_id, level);
- entry = ioapic->redirtbl[irq];
- irq_level ^= entry.fields.polarity;
- if (!irq_level)
- ioapic->irr &= ~mask;
- else {
- int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
- ioapic->irr |= mask;
- if ((edge && old_irr != ioapic->irr) ||
- (!edge && !entry.fields.remote_irr))
- ret = ioapic_service(ioapic, irq);
- else
- ret = 0; /* report coalesced interrupt */
- }
- trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
+ 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) {
+ ioapic->irr &= ~mask;
+ ret = 1;
+ } else {
+ int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
+ ioapic->irr |= mask;
+ if ((edge && old_irr != ioapic->irr) ||
+ (!edge && !entry.fields.remote_irr))
+ ret = ioapic_service(ioapic, irq);
+ else
+ ret = 0; /* report coalesced interrupt */
}
+ trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
spin_unlock(&ioapic->lock);
return ret;
--
MST
--
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