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KVM: x86: Avoid theoretical NULL pointer dereference in kvm_irq_delivery_to_apic_fast()

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commit 00b5f37189 upstream.

When kvm_irq_delivery_to_apic_fast() is called with APIC_DEST_SELF
shorthand, 'src' must not be NULL. Crash the VM with KVM_BUG_ON()
instead of crashing the host.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220325132140.25650-3-vkuznets@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2022-03-25 14:21:39 +01:00 committed by Greg Kroah-Hartman
parent c08175e48f
commit 9fa2b94443
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/lapic.c
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@ -992,6 +992,10 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
*r = -1;
if (irq->shorthand == APIC_DEST_SELF) {
if (KVM_BUG_ON(!src, kvm)) {
*r = 0;
return true;
}
*r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
return true;
}