diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt
index 2f1cbf1301d22..27ad53c7149d1 100644
--- a/Documentation/virtual/kvm/devices/s390_flic.txt
+++ b/Documentation/virtual/kvm/devices/s390_flic.txt
@@ -156,3 +156,6 @@ FLIC with an unknown group or attribute gives the error code EINVAL (instead of
 ENXIO, as specified in the API documentation). It is not possible to conclude
 that a FLIC operation is unavailable based on the error code resulting from a
 usage attempt.
+
+Note: The KVM_DEV_FLIC_CLEAR_IO_IRQ ioctl will return EINVAL in case a zero
+schid is specified.
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index a3da4f3065aa3..c8aacced23fb3 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2191,6 +2191,8 @@ static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
 		return -EINVAL;
 	if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
 		return -EFAULT;
+	if (!schid)
+		return -EINVAL;
 	kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
 	/*
 	 * If userspace is conforming to the architecture, we can have at most