KVM: x86: Catch potential overrun in MCE setup

[safe/jmp/linux-2.6] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9b96953..8a93fa8 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1692,7 +1692,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
        unsigned bank_num = mcg_cap & 0xff, bank;
 
        r = -EINVAL;
-       if (!bank_num)
+       if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
                goto out;
        if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
                goto out;