From 28a6fdabb3ea775d3d707afd9d2728b3ced2c34d Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Tue, 14 Aug 2012 19:20:28 +0300 Subject: 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: Michael S. Tsirkin Signed-off-by: Marcelo Tosatti --- virt/kvm/ioapic.c | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) (limited to 'virt') diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index ef61d529a6c..cfb7e4d52dc 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; -- cgit v1.2.3-18-g5258