[PATCH v3] KVM: x86: fix for missing initialization of return status variable

[Ameer Hamza]

If undefined ioctl number is passed to the kvm_vcpu_ioctl_device_attr
ioctl, we should trigger KVM_BUG_ON() and return with EIO to silent
coverity warning.

Addresses-Coverity: 1494124 ("Uninitialized scalar variable")
Signed-off-by: Ameer Hamza <amhamza.mgc@xxxxxxxxx>
---
Changes in v3:
Added KVM_BUG_ON() as default case and returned -EIO
---
 arch/x86/kvm/x86.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e0aa4dd53c7f..b37068f847ff 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5019,6 +5019,9 @@ static int kvm_vcpu_ioctl_device_attr(struct kvm_vcpu *vcpu,
 	case KVM_SET_DEVICE_ATTR:
 		r = kvm_arch_tsc_set_attr(vcpu, &attr);
 		break;
+	default:
+		KVM_BUG_ON(1, vcpu->kvm);
+		r = -EIO;
 	}
 
 	return r;
-- 
2.25.1