CVE-2021-47062

In the Linux kernel, the following vulnerability has been resolved: KVM:
SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs Use the
kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting VMSAs for
SEV, which effectively switches to use online_vcpus instead of
created_vcpus. This fixes a possible null-pointer dereference as
created_vcpus does not guarantee a vCPU exists, since it is updated at the
very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the bulk
of vCPU creation to run in parallel, while still correctly restricting the
max number of max vCPUs.