| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 279/389] KVM: x86: Avoid theoretical NULL pointer dereference in kvm_irq_delivery_to_apic_fast() | Date | Tue, 23 Aug 2022 10:25:57 +0200 |
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From: Vitaly Kuznetsov <vkuznets@redhat.com>
commit 00b5f37189d24ac3ed46cb7f11742094778c46ce 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: Stefan Ghinea <stefan.ghinea@windriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/x86/kvm/lapic.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -955,6 +955,10 @@ bool kvm_irq_delivery_to_apic_fast(struc *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; }
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