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authorMarcelo Tosatti <mtosatti@redhat.com>2009-10-29 13:44:16 -0200
committerAvi Kivity <avi@redhat.com>2009-12-03 09:32:23 +0200
commit2204ae3c96e9a1fed50f7ee19ce092e69d7dfe82 (patch)
tree8cf0b2bb779c833b401b96e46c26f444ab70955d /arch/x86
parent3ddea128ad75bd33e88780fe44f44c3717369b98 (diff)
KVM: x86: disallow KVM_{SET,GET}_LAPIC without allocated in-kernel lapic
Otherwise kvm might attempt to dereference a NULL pointer. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/x86.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 97f6f9565ac..cd6fe0a5797 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1893,6 +1893,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
switch (ioctl) {
case KVM_GET_LAPIC: {
+ r = -EINVAL;
+ if (!vcpu->arch.apic)
+ goto out;
lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
r = -ENOMEM;
@@ -1908,6 +1911,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
break;
}
case KVM_SET_LAPIC: {
+ r = -EINVAL;
+ if (!vcpu->arch.apic)
+ goto out;
lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
r = -ENOMEM;
if (!lapic)